CN108649945B - Vibration driving circuit - Google Patents
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- CN108649945B CN108649945B CN201810553433.8A CN201810553433A CN108649945B CN 108649945 B CN108649945 B CN 108649945B CN 201810553433 A CN201810553433 A CN 201810553433A CN 108649945 B CN108649945 B CN 108649945B
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- 238000012545 processing Methods 0.000 claims abstract description 95
- 239000000919 ceramic Substances 0.000 claims abstract description 72
- 238000003825 pressing Methods 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 88
- 230000005284 excitation Effects 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 2
- 238000004148 unit process Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012776 electronic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/964—Piezoelectric touch switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/96—Touch switches
- H03K2217/96062—Touch switches with tactile or haptic feedback
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Abstract
The invention provides a vibration driving circuit, and belongs to the technical field of detection of piezoelectric ceramic sensors. The vibration driving circuit comprises a piezoelectric ceramic key, a key sensing signal identification unit, a signal processing unit, a pulse generation unit and a pulse driving unit, wherein the key sensing signal identification unit processes a pressing signal transmitted by the piezoelectric ceramic key to obtain a pressing judgment signal, the signal processing chip of the signal processing unit controls the pulse generation unit to generate a high-voltage pulse signal when receiving the pressing judgment signal, and the pulse driving unit utilizes the high-voltage pulse signal to pulse and excite the piezoelectric ceramic key under the control of the signal processing unit so as to enable the piezoelectric ceramic key to vibrate, thereby providing accurate vibration feedback for a user, and enabling the user to determine whether the pressing action is effective or not through the sensing vibration feedback.
Description
Technical Field
The invention relates to the technical field of detection of piezoelectric ceramic sensors, in particular to a vibration driving circuit.
Background
Along with the continuous improvement of electronic manufacturing technology, microelectronic devices are rapidly entering the life of people, and piezoelectric ceramics have a ceramic material-piezoelectric effect capable of mutually converting mechanical energy and electric energy, and besides piezoelectricity, piezoelectric ceramics also have dielectricity, elasticity and the like, and are widely applied to the fields of medical imaging, acoustic sensors, acoustic transducers, ultrasonic motors and the like. Piezoelectric ceramics have taken up a considerable weight in the field of electronic materials and have found wide application in various industries. The piezoelectric ceramic key is made based on the principle of mutual conversion of mechanical energy and electric energy of piezoelectric ceramic, and when the piezoelectric ceramic key is subjected to the action of mechanical stress or senses a vibration signal, a voltage signal is output between two electrode surfaces of the piezoelectric ceramic; conversely, when an electrical signal is applied to the piezoelectric ceramic, it can also convert the electrical signal into a vibration signal. The existing touch keys can only output key signals, cannot feed back key operations of users, and cannot enable the users to accurately feel whether the users have completely pressed successfully.
Disclosure of Invention
The present invention is directed to a vibration driving circuit for improving the above problems of the prior art.
Embodiments of the present invention are implemented as follows:
The invention provides a vibration driving circuit which comprises a piezoelectric ceramic key, a key sensing signal identification unit, a signal processing unit, a pulse generating unit and a pulse driving unit. The piezoelectric ceramic key generates a pressing signal when being deformed by external force. The key sensing signal identification unit is connected with the piezoelectric ceramic key and is used for carrying out voltage reference elevation and related signal processing on the pressing signal to obtain a pressing judgment signal. The signal processing unit comprises a signal processing chip, and the signal processing chip is connected with the key sensing signal identification unit and obtains a pulse generation signal based on the pressing judgment signal. The pulse generating unit is connected with the signal processing unit and generates a high-voltage pulse signal when receiving the pulse generating signal. The pulse driving unit is connected with the pulse generating unit and the signal processing unit, and the high-voltage pulse signal is utilized to pulse the piezoelectric ceramic key under the control of the signal processing unit so as to enable the piezoelectric ceramic key to vibrate.
In an alternative embodiment of the present invention, the key sensing signal identifying unit includes a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor and a first diode, where the first end of the first capacitor is grounded, the second end of the first capacitor is connected to a common ground pin of the piezoelectric ceramic key and the first end of the second capacitor, the first end of the second capacitor is also connected to a reference voltage pin of the signal processing chip and a positive electrode of the first diode, the negative electrode of the first diode is connected to the second end of the second capacitor through the first resistor and the second resistor connected in series, the second end of the second capacitor is also connected to the first end of the third capacitor and the second pin of the signal processing chip, and the second end of the third capacitor is connected to the high voltage driving pin of the piezoelectric ceramic key and the detection pin, respectively.
In an alternative embodiment of the present invention, the key sensing signal identifying unit further includes a third resistor, a fourth resistor, a fifth resistor and a sixth resistor, where a first end of the third resistor is connected to a second end of the first capacitor, a second end of the third resistor is connected to one end of the second capacitor, a positive electrode of the first diode and a first end of the fourth resistor, a second end of the fourth resistor is connected to a reference voltage pin of the signal processing chip, the fifth resistor is connected in parallel between a positive electrode of the first diode and a second end of the first resistor, and the sixth resistor is connected in parallel between a second end of the first resistor and a high voltage driving pin of the piezoelectric ceramic key.
In an alternative embodiment of the present invention, the key sensing signal identification unit further includes a seventh resistor, a first end of the seventh resistor is connected to the high voltage driving pin of the piezoceramic key, and a second end of the seventh resistor is connected to the sixth resistor.
In an optional embodiment of the present invention, the signal processing unit further includes a fourth capacitor, an eighth resistor, and a ninth resistor, where a first pin of the signal processing chip is connected to a first end of the eighth resistor, a second end of the eighth resistor is connected to the first end of the ninth resistor and the first end of the fourth capacitor, respectively, a second end of the ninth resistor is connected to an external power supply, and a second end of the fourth capacitor is grounded.
In an alternative embodiment of the present invention, the signal processing unit further includes a fifth capacitor, a sixth pin of the signal processing chip is connected to a first end of the fifth capacitor, and a second end of the fifth capacitor is grounded.
In an alternative embodiment of the present invention, the pulse generating unit includes a first inductor, a second diode, a first triode, a second triode, a sixth capacitor and a seventh capacitor, where a first end of the first inductor is connected to a seventeenth pin of the signal processing chip and an external power supply, a second end of the first inductor is connected to a positive electrode of the second diode and a collector of the first triode, a negative electrode of the second diode is connected to a first end of the sixth capacitor, a first end of the seventh capacitor and a collector of the second triode, a base of the second triode is connected to a tenth pin of the signal processing chip and an emitter of the second triode, and a base of the first triode is connected to a twenty-fifth pin of the signal processing chip and an emitter of the first triode, and an emitter of the first triode is also connected to a second end of the sixth capacitor and a second end of the seventh capacitor, respectively.
In an alternative embodiment of the present invention, the sixth capacitor is a polar capacitor, an anode of the sixth capacitor is connected to a cathode of the second diode, and a cathode of the sixth capacitor is connected to an emitter of the first triode.
In an alternative embodiment of the present invention, the pulse driving unit includes a third triode, a fourth triode, and a third diode, where a base electrode of the third triode is connected to a sixteenth pin of the signal processing chip and an emitter electrode of the third triode, a collector electrode of the third triode is connected to the base electrode of the fourth triode and the emitter electrode of the fourth triode, an emitter electrode of the fourth triode is also connected to a negative electrode of the third diode, and a positive electrode of the third diode is connected to a collector electrode of the fourth triode and a high-voltage driving pin of the piezoelectric ceramic key.
In an alternative embodiment of the present invention, the pulse driving unit further includes a tenth resistor, an eleventh resistor, a twelfth resistor, and a thirteenth resistor, where a first end of the tenth resistor is connected to a sixteenth pin of the signal processing chip, a second end of the tenth resistor is connected to the first end of the eleventh resistor and the base of the third triode, respectively, a second end of the eleventh resistor is connected to the emitter of the third triode, the twelfth resistor is connected in series between the collector of the third triode and the base of the fourth triode, and the thirteenth resistor is connected in series between the base of the fourth triode and the emitter of the fourth triode.
The embodiment of the invention has the beneficial effects that:
The embodiment of the invention provides a vibration driving circuit, which is characterized in that a piezoelectric ceramic key generates a pressing signal when being deformed by external force, and the pressure received by the piezoelectric ceramic key is converted into an electric signal, so that a key sensing signal identification unit can judge whether the piezoelectric ceramic key is pressed or not through simple electric signal detection, and the pressing detection process is electrified, automatic, convenient and quick; the signal processing unit is used for carrying out centralized processing on information of other units and electric elements in the vibration driving circuit, so that the response speed and the response accuracy of the vibration driving circuit are greatly improved; the pulse driving unit is controlled by the signal processing unit to utilize the high-voltage pulse signal of the pulse generating unit to pulse the piezoelectric ceramic key to generate vibration, so that an accurate feedback signal is provided for a user, the user knows whether key operation is effective operation or not, and the key use efficiency of the user is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings in which like reference characters refer to the same parts throughout the several views, and which are not intended to be drawn to scale in actual size or the like, emphasis instead being placed upon illustrating the principles of the invention.
Fig. 1 is a schematic diagram of a module of a vibration driving circuit according to an embodiment of the present invention;
Fig. 2 is a circuit diagram of a key sensing signal recognition unit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a signal processing unit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a pulse generating unit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a pulse driving unit according to an embodiment of the present invention.
Icon: 10-a vibration driving circuit; 11-piezoceramic keys; 12-a key sensing signal recognition unit; 13-a signal processing unit; 14-a pulse generating unit; 15-pulse driving unit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, the azimuth or positional relationship indicated by the terms "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The present application discovers that the current touch key can only output the key signal, but does not have vibration prompt similar to the mechanical key, and can not provide more accurate key feedback signals, the key technology in the prior art mainly comprises two main types of mechanical keys and touch keys, wherein the mechanical keys control the on-off of a circuit through metal contact and non-contact, the touch keys are divided into resistance touch keys and capacitance touch keys, but the three key schemes have some defects, and some occasions can not meet the application, and the specific defects are as follows: the mechanical keys are mechanically moved, so that abrasion is generated, and finally the keys fail; both touch keys cannot meet the information feedback of a single key, so that a presser (such as a finger of a person) cannot confirm whether the key is pressed; the sensitivity of the resistance key is low, and the key point is easy to drift and lose the key function; the capacitive key is detected based on the fact that when a hand approaches the key, the capacitance value of the capacitor on the key is changed, a state of mistaken pressing or key failure can be generated in places with much water in a kitchen and a bathroom, and the underwater capacitive touch key cannot be used at all. In order to solve the above-described problems, an embodiment of the present application provides a vibration driving circuit 10.
Referring to fig. 1, fig. 1 is a schematic block diagram of a vibration driving circuit according to an embodiment of the invention.
The vibration drive circuit 10 includes a piezoelectric ceramic key 11, a key sensing signal recognition unit 12, a signal processing unit 13, a pulse generation unit 14, and a pulse drive unit 15. The piezoelectric ceramic key 11 generates a pressing signal when deformed by an external force; the key sensing signal identification unit 12 is connected with the piezoelectric ceramic key 11, and performs voltage reference elevation and related signal processing on the pressing signal to obtain a pressing judgment signal; the signal processing unit 13 includes a signal processing chip IC1, the signal processing chip IC1 being connected to the key sensing signal recognition unit 12 and obtaining a pulse generation signal based on the pressing judgment signal; the pulse generating unit 14 is connected with the signal processing unit 13 and generates a high-voltage pulse signal when receiving the pulse generating signal; the pulse driving unit 15 is connected to the pulse generating unit 14 and the signal processing unit 13, and uses the high-voltage pulse signal to pulse the piezoelectric ceramic key 11 under the control of the signal processing unit 13, so as to vibrate the piezoelectric ceramic key 11.
The piezoelectric ceramic key 11 has no mechanical abrasion, the service life of the key is longer than that of a mechanical key field, and meanwhile, the piezoelectric ceramic key 11 generates deformation to generate charge change, and the tiny charge change can be detected by a processor, so that the sensitivity is very high. In addition, the piezoelectric ceramic key 11 is deformed to generate charge change, and has no relation with the external environment, so that the piezoelectric ceramic key can be used in conductive occasions such as underwater. As an embodiment, the piezoelectric ceramic key 11 in this embodiment includes a high-voltage driving pin connected with the pulse driving unit 15 to vibrate the piezoelectric ceramic key 11 under the driving of the pulse signal, and a detection pin connected with the key sensing signal identifying unit 12 to enable the pressing signal generated when the piezoelectric ceramic key 11 is deformed by an external force to be transmitted to the key sensing signal identifying unit 12.
Referring to fig. 2, fig. 2 is a circuit diagram of a key sensing signal recognition unit according to an embodiment of the invention.
The key sensing signal recognition unit 12 is connected to the piezoelectric ceramic key 11, and is configured to perform voltage reference elevation and related signal processing on a pressing signal generated by the piezoelectric ceramic key 11 to obtain a pressing judgment signal. The key sensing signal identifying unit 12 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2 and a first diode D1, where a first end of the first capacitor C1 is grounded, a second end of the first capacitor C1 is connected to the common ground pin of the piezoelectric ceramic key 11 and a first end of the second capacitor C2, a first end of the second capacitor C2 is also connected to a reference voltage pin (fourth pin) of the signal processing chip IC1 and an anode of the first diode D1, a cathode of the first diode D1 is connected to a second end of the second capacitor C2 through a first resistor R1 and a second resistor R2 connected in series, a second end of the second capacitor C2 is also connected to a first end of the third capacitor C3 and a second pin of the signal processing chip IC1, and a second end of the third capacitor C3 is also connected to the high voltage driving pin of the piezoelectric ceramic key 11 and the detection pin.
As an alternative embodiment, the key sensing signal identifying unit 12 further includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6, where a first end of the third resistor R3 is connected to a second end of the first capacitor C1, a second end of the third resistor R3 is connected to one end of the second capacitor C2, an anode of the first diode D1, and a first end of the fourth resistor R4, a second end of the fourth resistor R4 is connected to a reference voltage pin of the signal processing chip IC1, the fifth resistor R5 is connected in parallel between the anode of the first diode D1 and the second end of the first resistor R1, and the sixth resistor R6 is connected in parallel between the second end of the first resistor R1 and the high voltage driving pin of the piezoelectric ceramic key 11.
Optionally, the key sensing signal identifying unit 12 further includes a seventh resistor R7, a first end of the seventh resistor R7 is connected to the high voltage driving pin of the piezoceramic key 11, and a second end of the seventh resistor R7 is connected to the sixth resistor R6.
Further, the key sensing signal identifying unit 12 may further include a switching diode D4, where an anode of the switching diode D4 is connected to the second end of the second capacitor C2, and a cathode thereof is grounded.
Referring to fig. 3, fig. 3 is a circuit diagram of a signal processing unit according to an embodiment of the invention.
The signal processing unit 13 is connected to the key sensing signal recognition unit 12, the pulse generation unit 14, and the pulse driving unit 15, respectively. The signal processing unit 13 is configured to determine whether the piezoelectric ceramic key 11 is pressed based on the pressing determination signal transmitted from the key sensing signal identifying unit 12, and send a pulse generation signal to the pulse generating unit 14 when the piezoelectric ceramic key 11 is pressed so that the pulse generating unit 14 generates a high voltage pulse signal, and is further configured to control the pulse driving unit 15 to pulse the piezoelectric ceramic key 11 by using the high voltage pulse signal so that the piezoelectric ceramic key 11 vibrates. The signal processing unit 13 includes a signal processing chip IC1 and a peripheral circuit thereof, where the peripheral circuit includes a fourth capacitor C4, an eighth resistor R8, and a ninth resistor R9, a first pin of the signal processing chip IC1 is connected to a first end of the eighth resistor R8, a second end of the eighth resistor R8 is connected to the first end of the ninth resistor R9 and the first end of the fourth capacitor C4, a second end of the ninth resistor R9 is connected to an external power supply, and a second end of the fourth capacitor C4 is grounded.
As an implementation manner, the signal processing unit 13 in this embodiment further includes a fifth capacitor C5, where the sixth pin of the signal processing chip IC1 is connected to the first end of the fifth capacitor C5, and the second end of the fifth capacitor C5 is grounded.
The signal processing chip IC1 may be an integrated circuit chip with signal processing capabilities. The signal processing chip IC1 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but may also be a digital signal processor (DIGITAL SIGNAL Processing, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), off-the-shelf programmable gate array (Field Programmable GATE ARRAY, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The general purpose processor may be a microprocessor or any conventional processor. In this embodiment, the signal processing chip IC1 may alternatively be a processor of STM32 series, for example, STM32F103C8T6, STM32F103VET6, or the like. Specifically, as an implementation manner, the signal processing chip IC1 in this embodiment is a PCI18F2480 type chip, and a 28-pin SPDIP, a 28-pin SOIC, and a 28-pin QFN package are used; PIC18F2480 is an 8-bit FLASH micro controller, and has a 32K programming space, 1536bytes of SRAM and 256bytesEEPROM on the chip, and has mW-level low power consumption technology, and only consumes 0.2 mu A of working current in a sleep mode; the on-chip self-contained system clock can reach the processing speed of 32MHz, can completely replace an external crystal oscillator, and simplifies the design of a circuit board; in addition, the method also has SPI, USART, TIMER and other peripheral resources, changes complex software command operation into assignment to related registers, and simplifies the design process; in the aspects of software debugging and programming, the downloading and online debugging of the program can be completed by only taking 4I/O pins, and the time spent on the debugging of the bottom hardware is greatly reduced. Alternatively, the signal processing chip IC1 in this embodiment may also be an upgrade of the PCI18F2480, i.e. a chip with the model PIC18F25K 80.
Referring to fig. 4, fig. 4 is a circuit diagram of a pulse generating unit according to an embodiment of the invention.
The pulse generating unit 14 is connected to the signal processing unit 13 and the pulse driving unit 15, respectively, and is configured to generate a high-voltage pulse signal under the control of the pulse generating signal transmitted from the signal processing unit 13 and transmit the high-voltage pulse signal to the pulse driving unit 15. The specific principle of the pulse generating unit 14 is: the high-voltage pulse suitable for the piezoelectric ceramic key 11 is generated through the inductor and the triode (MOS tube), the vibration of the piezoelectric ceramic sheet can be controlled through the pulse driving unit 15, the high-voltage pulse charge is rapidly discharged through the second triode Q2, and then the piezoelectric ceramic sheet is rapidly deformed to generate stronger shock feeling. Therefore, the vibration driving circuit 10 in the embodiment of the invention has low requirement on environmental variables and high accuracy, and does not have the phenomenon of insensitive touch caused by charge accumulation or environmental temperature and humidity change for a long time of the touch screen.
The pulse generating unit 14 includes a first inductor L1, a second diode D2, a first triode Q1, a second triode Q2, a sixth capacitor C6, and a seventh capacitor C7, where a first end of the first inductor L1 is connected to a seventeenth pin of the signal processing chip IC1 and an external power supply (may be 12V), a second end of the first inductor L1 is connected to an anode of the second diode D2 and a collector of the first triode D1, a cathode of the second diode D2 is connected to a first end of the sixth capacitor C6, a first end of the seventh capacitor C7, and a collector of the second triode Q2, a base of the second triode Q2 is connected to a tenth pin of the signal processing chip IC1 and an emitter of the second triode Q2, and a base of the first triode Q1 is connected to a twenty-fifth pin of the signal processing chip IC1 and an emitter of the first triode Q1, and an emitter of the second triode Q1 is also connected to a second end of the sixth capacitor C6 and a second end of the seventh capacitor C7. Optionally, the sixth capacitor C6 is a polar capacitor, and the first end of the sixth capacitor C6 is a positive electrode and the second end is a negative electrode.
Referring to fig. 5, fig. 5 is a circuit diagram of a pulse driving unit according to an embodiment of the invention.
The pulse driving unit 15 is connected to the piezoelectric ceramic key 11, the signal processing unit 13, and the pulse generating unit 14, respectively. The pulse driving unit 15 is configured to pulse the piezoelectric ceramic key 11 with the high-voltage pulse signal generated by the pulse generating unit 14 after receiving the circuit closing signal of the signal processing unit 13. As an alternative embodiment, the pulse driving unit 15 includes a third triode Q3, a fourth triode Q4, and a third diode D3, where a base electrode of the third triode Q3 is connected to a sixteenth pin of the signal processing chip IC1 and an emitter electrode of the third triode Q3, a collector electrode of the third triode Q3 is connected to a base electrode of the fourth triode Q4 and an emitter electrode of the fourth triode Q4, an emitter electrode of the fourth triode Q4 is further connected to a negative electrode of the third diode D3, and an anode electrode of the third diode D3 is connected to a collector electrode of the fourth triode Q4 and a high-voltage driving pin of the piezoelectric ceramic key 11.
Further, as an alternative embodiment, the pulse driving unit 15 further includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13, where a first end of the tenth resistor R10 is connected to the sixteenth pin of the signal processing chip IC1, a second end of the tenth resistor R10 is connected to the first end of the eleventh resistor R11 and the base of the third transistor Q3, a second end of the eleventh resistor R11 is connected to the emitter of the third transistor Q3, the twelfth resistor R12 is connected in series between the collector of the third transistor Q3 and the base of the fourth transistor Q4, and the thirteenth resistor R13 is connected in series between the base and the emitter of the fourth transistor Q4.
The working principle of the vibration driving circuit 10 provided by the embodiment of the invention is as follows:
The operator presses the piezoelectric ceramic key 11, the piezoelectric ceramic key 11 generates a pressing signal when being pressed by an external force and transmits the pressing signal to the key sensing signal recognition unit 12, the key sensing signal recognition unit 12 obtains a pressing judgment signal after performing voltage reference elevation and related signal processing on the pressing signal and transmits the pressing judgment signal to the signal processing unit 13, the signal processing unit 13 judges whether the operator finishes effective pressing operation on the piezoelectric ceramic key 11 according to the pressing judgment signal, and if yes, the signal processing unit 13 sends out a pulse generation signal to the pulse generation unit 14 to enable the pulse generation unit 14 to generate a high-voltage pulse signal, meanwhile, the signal processing unit 13 controls the pulse driving unit 15 to close a switch, and the piezoelectric ceramic key 11 is excited by the high-voltage pulse signal to enable the piezoelectric ceramic key 11 to generate vibration feedback.
In summary, the embodiment of the invention provides a vibration driving circuit, which generates a pressing signal when a piezoelectric ceramic key is deformed by an external force, and converts the pressure received by the piezoelectric ceramic key into an electric signal, so that a key sensing signal identification unit can judge whether the piezoelectric ceramic key is pressed or not through simple electric signal detection, and the pressing detection process is electrified, automatic, convenient and quick; the signal processing unit is used for carrying out centralized processing on information of other units and electric elements in the vibration driving circuit, so that the response speed and the response accuracy of the vibration driving circuit are greatly improved; the pulse driving unit is controlled by the signal processing unit to utilize the high-voltage pulse signal of the pulse generating unit to pulse the piezoelectric ceramic key to generate vibration, so that an accurate feedback signal is provided for a user, the user knows whether key operation is effective operation or not, and the key use efficiency of the user is improved.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A vibration driving circuit, characterized by comprising:
The piezoelectric ceramic key generates a pressing signal when being deformed by external force;
The key sensing signal identification unit is connected with the piezoelectric ceramic key and used for carrying out voltage reference elevation and related signal processing on the pressing signal to obtain a pressing judgment signal;
the signal processing unit comprises a signal processing chip, and the signal processing chip is connected with the key sensing signal identification unit and obtains a pulse generation signal based on the pressing judgment signal;
The pulse generating unit is connected with the signal processing unit and generates a high-voltage pulse signal when receiving the pulse generating signal;
The pulse driving unit is connected with the pulse generating unit and the signal processing unit, and is used for carrying out pulse excitation on the piezoelectric ceramic key by utilizing the high-voltage pulse signal under the control of the signal processing unit so as to enable the piezoelectric ceramic key to vibrate;
The key sensing signal identification unit comprises a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor and a first diode, wherein the first end of the first capacitor is grounded, the second end of the first capacitor is respectively connected with a public grounding pin of the piezoelectric ceramic key and the first end of the second capacitor, the first end of the second capacitor is also respectively connected with a reference voltage pin of the signal processing chip and the positive electrode of the first diode, the negative electrode of the first diode is connected with the second end of the second capacitor through the first resistor and the second resistor which are connected in series, the second end of the second capacitor is also respectively connected with the first end of the third capacitor and the second pin of the signal processing chip, and the second end of the third capacitor is respectively connected with a high-voltage driving pin and a detection pin of the piezoelectric ceramic key;
the key sensing signal identification unit further comprises a third resistor, a fourth resistor, a fifth resistor and a sixth resistor, wherein the first end of the third resistor is connected with the second end of the first capacitor, the second end of the third resistor is respectively connected with one end of the second capacitor, the positive electrode of the first diode and the first end of the fourth resistor, the second end of the fourth resistor is connected with a reference voltage pin of the signal processing chip, the fifth resistor is connected between the positive electrode of the first diode and the second end of the first resistor in parallel, and the sixth resistor is connected between the second end of the first resistor and a high-voltage driving pin of the piezoelectric ceramic key in parallel;
The key sensing signal identification unit further comprises a seventh resistor, a first end of the seventh resistor is connected with the high-voltage driving pin of the piezoceramic key, and a second end of the seventh resistor is connected with the sixth resistor.
2. The vibration driving circuit according to claim 1, wherein the signal processing unit further comprises a fourth capacitor, an eighth resistor and a ninth resistor, the first pin of the signal processing chip is connected to the first end of the eighth resistor, the second end of the eighth resistor is connected to the first end of the ninth resistor and the first end of the fourth capacitor, respectively, the second end of the ninth resistor is connected to an external power supply, and the second end of the fourth capacitor is grounded.
3. The vibration driving circuit according to claim 2, wherein the signal processing unit further comprises a fifth capacitor, the sixth pin of the signal processing chip is connected to the first end of the fifth capacitor, and the second end of the fifth capacitor is grounded.
4. The vibration driving circuit according to claim 1, wherein the pulse generating unit comprises a first inductor, a second diode, a first triode, a second triode, a sixth capacitor and a seventh capacitor, wherein a first end of the first inductor is connected with a seventeenth pin of the signal processing chip and an external power supply respectively, a second end of the first inductor is connected with a positive electrode of the second diode and a collector of the first triode respectively, a negative electrode of the second diode is connected with a first end of the sixth capacitor, a first end of the seventh capacitor and a collector of the second triode respectively, a base of the second triode is connected with a tenth pin of the signal processing chip and an emitter of the second triode respectively, a base of the first triode is connected with a twenty-fifth pin of the signal processing chip and an emitter of the first triode respectively, and an emitter of the first triode is also connected with a second end of the sixth capacitor and a second end of the seventh capacitor respectively.
5. The vibration driving circuit according to claim 4, wherein the sixth capacitor is a polar capacitor, an anode of the sixth capacitor is connected to a cathode of the second diode, and a cathode of the sixth capacitor is connected to an emitter of the first transistor.
6. The vibration driving circuit according to claim 1, wherein the pulse driving unit comprises a third triode, a fourth triode and a third diode, wherein a base electrode of the third triode is respectively connected with a sixteenth pin of the signal processing chip and an emitter electrode of the third triode, a collector electrode of the third triode is respectively connected with the base electrode of the fourth triode and the emitter electrode of the fourth triode, an emitter electrode of the fourth triode is also connected with a cathode electrode of the third diode, and an anode electrode of the third diode is respectively connected with a collector electrode of the fourth triode and a high-voltage driving pin of the piezoelectric ceramic key.
7. The vibration driving circuit according to claim 6, wherein the pulse driving unit further comprises a tenth resistor, an eleventh resistor, a twelfth resistor, and a thirteenth resistor, a first end of the tenth resistor is connected to a sixteenth pin of the signal processing chip, a second end of the tenth resistor is connected to the first end of the eleventh resistor and the base of the third transistor, respectively, a second end of the eleventh resistor is connected to the emitter of the third transistor, the twelfth resistor is connected in series between the collector of the third transistor and the base of the fourth transistor, and the thirteenth resistor is connected in series between the base and the emitter of the fourth transistor.
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| CN112332694B (en) * | 2020-10-27 | 2025-02-21 | 深圳泓越信息科技有限公司 | Piezoelectric ceramic drive circuit |
| CN113346807B (en) * | 2021-07-16 | 2023-01-31 | 重庆大学 | Two-phase stepping motor drive control circuit for deep sea electric pan-tilt |
| CN113794471B (en) * | 2021-09-10 | 2023-06-20 | 厦门科牧智能技术有限公司 | Circuit and method for delaying key corrosion and control handle |
| CN115754690A (en) * | 2022-10-31 | 2023-03-07 | 歌尔股份有限公司 | Detection method, device and equipment for touch feedback key and storage medium |
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