CN110442234B

CN110442234B - Electronic equipment and vibration feedback system

Info

Publication number: CN110442234B
Application number: CN201910581397.0A
Authority: CN
Inventors: 刘宁; 解峰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-06-29
Filing date: 2019-06-29
Publication date: 2021-06-01
Anticipated expiration: 2039-06-29
Also published as: WO2021000810A1; CN110442234A

Abstract

The embodiment of the application provides an electronic device and a vibration feedback system, wherein the electronic device comprises: the piezoelectric ceramic sensor comprises a touch panel, a piezoelectric ceramic sensor, a driving circuit, a power circuit and a controller; the piezoelectric ceramic sensor is respectively coupled with the driving circuit and the controller, and the driving circuit is respectively coupled with the controller and the power circuit. The touch pad is in direct or indirect contact with the piezoceramic sensor. The power supply circuit may provide an input voltage to the driving circuit; the touch pad can transmit the pressure applied by a user on the touch pad to the piezoelectric ceramic sensor, the piezoelectric ceramic sensor can generate a sensing signal after receiving the pressure transmitted by the touch pad, the controller can control the driving circuit to generate a driving signal after receiving the sensing signal generated by the piezoelectric ceramic sensor, and the driving signal can drive the piezoelectric ceramic sensor to vibrate so that the user can sense the vibration through the touch pad. By adopting the scheme, the structure of the electronic equipment is facilitated to be simplified, and the cost of the electronic equipment is reduced.

Description

Electronic equipment and vibration feedback system

Technical Field

The application relates to the technical field of electronics, in particular to an electronic device and a vibration feedback system.

Background

Currently in the consumer electronics and household appliance markets, the function keys or touch pads of many electronic devices have a vibration feedback function. Taking the touch pad of the notebook computer as an example, a vibration feedback system can be arranged under the touch pad. The vibration feedback system includes a capacitive sensor array distributed under the touch panel, a vibration motor disposed under the capacitive sensor array, a controller, and a driving circuit for the vibration motor. When a user presses the touch pad, the capacitive sensor array can sense the pressing operation of the user, so that a sensing signal is generated. The controller can further control a driving circuit of the vibration motor array to drive the vibration motor to vibrate according to the sensing signals generated by the capacitance sensor array, and the vibration generated by the vibration motor can be transmitted to the touch pad, so that a user can feel the vibration fed back by the touch pad.

However, the conventional vibration feedback system has a complicated structure and a high cost of the vibration motor, and the conventional electronic device with the vibration feedback function needs further research.

Disclosure of Invention

An object of the application is to provide an electronic equipment and vibrations feedback system, can utilize the piezoelectric effect of piezoceramics sensor, through the operation of pressing of piezoceramics sensor response user on the touch pad to transmit vibrations to the touch pad through piezoceramics sensor, be favorable to simplifying vibrations feedback system, and reduce vibrations feedback system's cost.

The above and other objects are achieved by the features of the independent claims. Further implementations are presented in the dependent claims, the description and the drawings.

In a first aspect, an embodiment of the present application provides an electronic device, where the electronic device includes: the device comprises a touch panel, a piezoelectric ceramic sensor, a driving circuit and a controller; the piezoelectric ceramic sensor is coupled with the controller, the controller is respectively coupled with the piezoelectric ceramic sensor and the driving circuit, and the driving circuit is respectively coupled with the power circuit and the controller. The touch pad is in direct or indirect contact with the piezoelectric ceramic sensor; the power supply circuit is coupled with the driving circuit; in the working process of the electronic equipment, the power supply circuit can provide input voltage for the driving circuit, the touch panel can transmit the pressure applied by a user on the touch panel to the piezoelectric ceramic sensor, the piezoelectric ceramic sensor can generate induction signals after receiving the pressure transmitted by the touch panel, and the controller can control the driving circuit to generate driving signals after receiving the induction signals generated by the piezoelectric ceramic sensor, wherein the driving signals can drive the piezoelectric ceramic sensor to generate vibration. Further, the user can sense the vibration generated by the piezoelectric ceramic sensor through the touch panel.

In the electronic device, the piezoelectric ceramic sensor has a piezoelectric effect, so that the piezoelectric ceramic sensor can be used for generating an induction signal and vibration, and the piezoelectric ceramic sensor can replace a conventional capacitance sensor array and a vibration motor, and is favorable for simplifying the structure of the electronic device. Moreover, the cost of the piezo-ceramic sensor is generally lower than that of the vibrating motor, and therefore, it is also advantageous to reduce the cost of the electronic device.

In one possible implementation manner, the driving circuit may include a voltage boosting unit, an input terminal of the voltage boosting unit is coupled with the power supply circuit, an output terminal of the voltage boosting unit is coupled with the piezoelectric ceramic sensor, and a control terminal of the voltage boosting unit is coupled with the controller; the controller may transmit a first control signal to the boosting unit when controlling the driving circuit to generate the driving signal; the boosting unit may perform a boosting operation on the input voltage provided by the power supply circuit to obtain the driving signal after receiving the first control signal.

The boosting unit can boost the input voltage provided by the power circuit to obtain a driving signal, so that the driving signal has a higher voltage value, and the piezoelectric ceramic sensor can be driven to vibrate. Moreover, the voltage value of the driving signal is higher, so that the vibration amplitude of the piezoelectric ceramic sensor can be increased, and a user can easily feel the vibration fed back by the touch panel.

In a possible implementation manner, the driving circuit further includes a power supply control unit, an input end of the power supply control unit is coupled with the power supply circuit, an output end of the power supply control unit is coupled with the voltage boosting unit, and a control end of the power supply control unit is coupled with the controller; the controller may send a second control signal to the power control unit when controlling the driving circuit to generate the driving signal; the power supply control unit may turn on a transmission path between the power supply circuit and the boosting unit after receiving the second control signal.

The controller can disconnect a transmission path between the power circuit and the boosting unit through the power control unit when the induction signal is not received, so that the power consumption of the electronic equipment is saved. After the induction signal is received, the power supply control unit is controlled to conduct a transmission path between the power supply circuit and the boosting unit, so that the boosting unit can perform boosting operation on the input voltage provided by the power supply circuit to obtain a driving signal.

In a possible implementation manner, the driving circuit may further include a switching unit, an input end of the switching unit is coupled to the voltage boosting unit, an output end of the switching unit is coupled to the piezoelectric ceramic sensor, and a control end of the switching unit is coupled to the controller; the controller may transmit a third control signal to the switching unit when controlling the driving circuit to generate the driving signal; the switching unit may turn on a transmission path between the boosting unit and the piezoelectric ceramic sensor after receiving the third control signal.

The controller can switch on or off the transmission path of the driving signal through the switch unit, and the driving signal can drive the piezoelectric ceramic sensor to vibrate when the transmission path of the driving signal is switched on. When the transmission path of the driving signal is cut off, the piezoelectric ceramic sensor stops vibrating. Therefore, the controller can more flexibly turn on or off the vibration of the piezoelectric ceramic sensor through the switch unit.

In one possible implementation manner, the electronic device may include a plurality of piezoelectric ceramic sensors, the driving circuit includes a plurality of switch units, and output ends of the plurality of switch units are respectively coupled with the plurality of piezoelectric ceramic sensors in a one-to-one correspondence manner; the controller may transmit the third control signal to a target switch unit of the plurality of switch units when transmitting the third control signal to the switch unit, where the target switch unit is a switch unit of the plurality of switch units that is correspondingly coupled to the target sensor, and the target sensor is a sensor of the plurality of piezoelectric ceramic sensors that generates an induction signal.

In the case where a plurality of piezoceramic sensors are included in the electronic device, the controller may control the piezoceramic sensors at the pressed positions to vibrate in a targeted manner. In the embodiment of the application, the piezoelectric ceramic sensor can generate the sensing signal and can vibrate, so that the controller can realize vibration feedback at the pressed position without excessively calculating the position information of the piezoelectric ceramic sensor.

In one possible implementation manner, the controller includes a plurality of sensing ports, the plurality of sensing ports are respectively coupled with anodes of the plurality of piezoelectric ceramic sensors in a one-to-one correspondence manner, and cathodes of the plurality of piezoelectric ceramic sensors are connected in parallel; the controller can respectively acquire the voltage values of the positive voltages of the piezoelectric ceramic sensors through the plurality of induction ports; the controller determines a piezoelectric ceramic sensor, of the plurality of piezoelectric ceramic sensors, with a voltage value of the positive voltage being greater than a preset voltage value as a target sensor.

When the piezoelectric ceramic sensor is discharged, the voltage of the positive electrode of the piezoelectric ceramic sensor increases. Therefore, the controller can determine the piezoelectric ceramic sensor generating the sensing signal, i.e., the target sensor, according to the voltage value of the positive electrode voltage of the piezoelectric ceramic sensor detected by each sensing port.

In one possible implementation, any one of a plurality of switching units, the switching unit including a first transistor, a second transistor, and a first resistor; a first electrode of the first transistor is coupled with the boosting unit, a second electrode of the first transistor is coupled with the piezoelectric ceramic sensor corresponding to the switch unit, and a control electrode of the first transistor is coupled with a first electrode of the second transistor; a second electrode of the second transistor is coupled with a first induction port in the plurality of induction ports, the first induction port is an induction port coupled with the piezoelectric ceramic sensor corresponding to the switch unit, and a control electrode of the second transistor is coupled with an opening port of the controller; one end of the first resistor is coupled with the first electrode of the first transistor, and the other end of the first resistor is coupled with the control electrode of the first electrode; the controller may output the first voltage from the sensing port corresponding to the target sensor and output the second voltage from the sensing ports other than the sensing port corresponding to the target sensor when transmitting the third control signal to the target switching unit among the plurality of switching units; the controller outputs a third control signal from the turn-on port, a voltage value of the third control signal being between a voltage value of the first voltage and a voltage value of the second voltage.

The controller applies voltages of different magnitudes to the second electrodes of the second transistors in the plurality of switching units through the sensing port, and the voltage value of the third control signal is between the voltage value of the first voltage and the voltage value of the second voltage, so that the third control signal can satisfy the turn-on condition of the second transistors of some switching units (i.e., target switching units) but not the turn-on condition of the second transistors of other switching units. Therefore, by adopting the technical scheme, the target switch unit in the switch units can be turned on in a targeted manner through one opening port, and the saving of the ports of the controller is facilitated.

For example, the first transistor may be a PNP transistor, the second transistor may be an NPN transistor, and the voltage value of the first voltage is smaller than the voltage value of the second voltage.

In one possible implementation, the controller may be further coupled to an output of the boosting unit; the controller may further obtain a voltage value of the output voltage of the boosting unit before transmitting the third control signal to the switching unit; the controller transmits a third control signal to the switching unit after the voltage value of the output voltage of the boosting unit reaches a preset voltage threshold.

For example, some boosting units may need a certain time delay to boost the voltage of the input voltage to the preset voltage threshold, and if the transmission path of the driving signal is turned on before the output voltage of the boosting unit reaches the preset voltage threshold, the voltage value of the driving signal may be low, the vibration of the piezoelectric ceramic sensor is not obvious, and the user experience is affected. Therefore, by adopting the scheme, the transmission path of the driving signal is conducted after the voltage value of the output voltage of the boosting unit reaches the preset voltage threshold value, so that the output voltage of the driving signal is favorably improved, the piezoelectric ceramic sensor can vibrate more obviously, and the user experience is improved.

In a possible implementation manner, the driving circuit may further include a voltage dividing unit, an input end of the voltage dividing unit is coupled to the voltage boosting unit, an output end of the voltage dividing unit is coupled to the controller, and the voltage dividing unit is configured to divide the output voltage of the voltage boosting unit according to a voltage dividing ratio; the controller detects the voltage value of the input voltage provided by the voltage dividing unit when acquiring the voltage value of the output voltage of the boosting unit; and the controller calculates the voltage value of the output voltage of the boosting unit according to the voltage value of the input voltage and the voltage division ratio.

Since the output voltage of the booster unit can reach a large voltage value, the controller may be damaged by directly detecting the output voltage of the booster unit. In view of this, the voltage dividing unit is adopted to divide the output voltage of the voltage boosting unit, which is beneficial to protecting the circuit safety of the controller.

In a possible implementation manner, the controller may further start timing when receiving at least one sensing signal generated by the at least one piezoceramic sensor; and the controller stops sending the third control signal to the switch unit after the timing reaches a preset time threshold.

For example, the preset time threshold may be a time length of one pressing operation calculated by means of experience, data statistics, operation simulation, and the like. When the timing reaches the preset time threshold, the user can be considered that the finger of the user leaves the touch pad, and at the moment, the controller can stop sending the third control signal to the switch unit, so that the vibration of the piezoelectric ceramic sensor is stopped.

In a possible implementation manner, the driving circuit may further include a discharging unit, an input terminal of the discharging unit is coupled to the output terminal of the boosting unit and the input terminal of the switching unit, respectively, an output terminal of the discharging unit is grounded, and a control terminal of the discharging unit is coupled to the controller; the controller may further transmit a fourth control signal to the discharging unit after stopping transmitting the third control signal to the switching unit; the discharging unit may turn on a transmission path between the boosting unit and the switching unit and the ground upon receiving the fourth control signal.

After the switch unit is turned off, a certain amount of residual charges may still exist between the boosting unit and the switch unit, and the residual charges may accelerate the circuit aging. In view of this, after the controller closes the switch unit, the discharging unit may be further turned on, so that the discharging unit releases the residual charge between the boosting unit and the switch unit to the ground, which is beneficial to prolonging the service life of the vibration feedback system.

In one possible implementation, the boost unit includes a boost circuit and a multi-voltage circuit; the input end of the boost circuit is coupled with the power supply circuit, the output end of the boost circuit is coupled with the input end of the multi-voltage circuit, and the control end of the boost circuit is coupled with the controller; the boost circuit may boost the input voltage provided by the power supply circuit after receiving the first control signal, and provide the boosted input voltage to the voltage-multiplying circuit; the output end of the multi-voltage circuit is coupled with the piezoelectric ceramic sensor; the multi-voltage circuit can boost the boosted input voltage provided by the boost circuit to obtain the driving signal.

The boost circuit has high boosting capacity, but has high requirements on electrical parameters of capacitance and inductance in the circuit. Under the condition that the output voltage of the boost circuit is higher, the capacitance and the inductance in the circuit occupy larger space, and the electrical service life is shorter. The multi-voltage circuit is simple in structure and small in occupied space. The boost circuit and the multi-voltage circuit are combined for use, so that the space occupied by the boost circuit is reduced, higher output voltage is output, and the effect of taking the two factors of the occupied space and the boosting capacity of the boost unit into consideration is realized.

In a second aspect, an embodiment of the present application provides a vibration feedback system that may be applied to an electronic device including a touch panel and a power supply circuit, the vibration feedback system including: the piezoelectric ceramic sensor, the drive circuit and the controller; the controller is respectively coupled with the piezoelectric ceramic sensor and the driving circuit, the piezoelectric ceramic sensor is respectively coupled with the driving circuit and the controller, and the driving circuit is respectively coupled with the piezoelectric ceramic sensor and the controller. The touch pad is in direct or indirect contact with the piezoceramic sensor. The power circuit is coupled with the driving circuit. Wherein the power supply circuit can provide an input voltage for the driving circuit. The touch pad can transmit the pressure applied by the user on the touch pad to the piezoelectric ceramic sensor; the piezoelectric ceramic sensor is used for generating a sensing signal after receiving the pressure transmitted by the touch panel; the controller can control the driving circuit to generate a driving signal after receiving the sensing signal generated by the piezoelectric ceramic sensor, and the driving signal can be used for driving the piezoelectric ceramic sensor to generate vibration, so that a user can sense the vibration generated by the piezoelectric ceramic sensor through the touch panel.

In a possible implementation manner, the driving circuit may further include a power supply control unit, an input end of the power supply control unit is coupled with the power supply circuit, an output end of the power supply control unit is coupled with the voltage boosting unit, and a control end of the power supply control unit is coupled with the controller; the controller may send a second control signal to the power control unit when controlling the driving circuit to generate the driving signal; the power supply control unit may turn on a transmission path between the power supply circuit and the boosting unit after receiving the second control signal.

In a possible implementation manner, the controller may further start timing after receiving at least one sensing signal generated by the at least one piezoceramic sensor; and the controller stops sending the third control signal to the switch unit after the timing reaches a preset time threshold.

In a possible implementation manner, the driving circuit may further include a discharging unit, an input end of the discharging unit is coupled to the output end of the boosting unit and the input end of the switching unit, respectively, an output end of the discharging unit is grounded, and a control end of the discharging unit is coupled to the controller; the controller may further transmit a fourth control signal to the discharging unit after stopping transmitting the third control signal to the switching unit; the discharging unit may turn on a transmission path between the boosting unit and the switching unit and the ground after receiving the fourth control signal.

Drawings

FIG. 1 is a schematic diagram of an electronic device;

FIG. 2 is an exploded view of a seismic feedback system;

FIG. 3 is an exploded view of a seismic feedback system according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a vibration feedback system according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a possible vibration feedback system according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a boosting unit according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a periodic signal according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a voltage dividing unit according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a power control unit according to an embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of a switch unit according to an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of a discharge cell according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

Currently, more and more touch-control electronic devices have a vibration feedback function, such as notebook computers, touch-control home appliances (air conditioners, washing machines, microwave ovens, etc.), smart phones, tablet computers, and the like. Taking the notebook computer shown in fig. 1 as an example, a vibration feedback system is disposed below the touch panel 100 in the notebook computer, and when the user presses the touch panel 100, the vibration feedback system can sense the pressing operation of the user and drive the touch panel 100 to vibrate, thereby implementing vibration feedback. The touch panel 100 feeds back a vibration when the user presses, which may improve the tactile sensation of the user's fingers when pressing, and may enable the user to determine whether the notebook computer has recognized the pressing operation on the touch panel 100 according to whether the user feels the vibration.

In one implementation, a vibration feedback system as shown in FIG. 2 may be provided beneath the touch panel 100. FIG. 2 is an exploded view of a seismic feedback system including a capacitive sensor array, a controller, a seismic motor, and a drive circuit.

When the user presses the touch panel 100, the pressed position on the touch panel 100 may be deformed to be recessed inside the electronic device. The capacitive sensor array is disposed below the touch panel 100, and since the pressed position on the touch panel 100 is recessed toward the inside of the electronic device, the pressure applied by the user on the touch panel 100 can be applied to the capacitive sensor below the pressed position, that is, the pressure applied by the user on the touch panel 100 is transmitted to the capacitive sensor below the pressed position. The capacitive sensor under the pressed position is pressurized and discharged, thereby generating a sensing signal.

The controller can control the driving circuit to generate a driving signal after receiving the sensing signal provided by the capacitance sensor, and the driving circuit provides the driving signal to the vibration motor so as to drive the vibration motor to vibrate. The vibration generated by the vibration motor may be transmitted to the touch panel 100, so as to drive the touch panel 100 to vibrate, and thus, the user may feel that the vibration is fed back by the touch panel 100.

However, in the vibration feedback system described above, the cost of the vibration motor is generally high. Although some manufacturers may reduce the number of vibration motors to achieve cost savings, the reduced number of vibration motors may cause false-click problems. So-called false pressing, i.e. when the user presses the touch panel 100, the user does not feel the vibration fed back by the touch panel 100, so that the false pressing problem affects the user experience.

In summary, the current vibration feedback system is still under further study. In view of the above, the present disclosure provides a novel vibration feedback system, so as to reduce the cost of the vibration feedback system. In the vibration feedback system provided by the embodiment of the present application, the functions of the capacitance sensor and the vibration motor may be implemented by at least one piezoelectric ceramic sensor. Specifically, the piezo ceramic sensor has a piezo effect in that the piezo ceramic sensor may discharge electricity when it is pressurized and may generate vibration when it is charged.

The piezoelectric ceramic sensor can achieve the function of sensing the pressing operation of a user due to the discharge characteristic of the piezoelectric ceramic sensor when being pressed, and can achieve the function of generating vibration due to the vibration characteristic of the piezoelectric ceramic sensor when being charged. Because the vibration feedback system provided by the embodiment of the application can omit a capacitance sensor array and a vibration motor, and the cost of the piezoelectric ceramic sensor is usually far less than that of the vibration motor, the vibration feedback system provided by the embodiment of the application is beneficial to reducing the cost of the vibration feedback system on the whole.

The specific methods of operation in the method embodiments described below may also be applied to the apparatus embodiments or the system embodiments. It is to be noted that "at least one" in the description of the present application means one or more, where a plurality means two or more. In view of this, the "plurality" may also be understood as "at least two" in the embodiments of the present invention. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship, unless otherwise specified. In addition, it is to be understood that the terms first, second, etc. in the description of the present application are used for distinguishing between the descriptions and not necessarily for describing a sequential or chronological order.

For convenience, specific spatially relative terminology is used in the following description and is not intended to be limiting. The words "upper" and "lower" designate directions in the drawings to which reference is made. The terminology includes the words above specifically mentioned, derivatives thereof and words of similar import. "over.," above … …, "on … … surface," "above," and the like are used to describe one device or feature as it appears in the figures in spatial relationship to another device or feature. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

For example, fig. 3 is an exploded view of a seismic feedback system according to an embodiment of the present application. As shown in fig. 3, the vibration feedback system mainly includes at least one piezoceramic sensor 201, a controller 202, and a drive circuit 203. In this case, the plurality of piezoceramic sensors 201 may be arranged in an array and disposed under the touch panel 100, as shown in fig. 3. The array arrangement is adopted, so that the piezoelectric ceramic sensors 201 are arranged at the positions below the touch panel 100, the virtual press problem is reduced, and the use experience of a user is improved.

It is understood that at least one piezoceramic sensor 201 in the vibration feedback system may be in direct contact with the touch panel 100 or in indirect contact with the touch panel 100, for example, a protective layer covering the piezoceramic sensor 201 may be disposed between the piezoceramic sensor 201 and the touch panel 100 to protect the piezoceramic sensor 201, in this case, although the piezoceramic sensor 201 is not in direct contact with the touch panel 100, the vibration generated by the piezoceramic sensor 201 may still be transmitted to the touch panel 100 through the protective film, so as to drive the touch panel 100 to vibrate.

In the vibration feedback system shown in fig. 3, the driving circuit 203 may be fabricated on a Printed Circuit Board (PCB), which may be a main board of the electronic device or a sub-board of the electronic device. In a possible implementation manner, the controller 202 may also be disposed on a PCB where the driving circuit 203 is located, and the controller 202 may be implemented by a Micro Controller Unit (MCU), where a program instruction is installed to enable the MCU to implement the functions of the controller 202. In this case, the controller 202 may also be coupled to a Central Processing Unit (CPU) via a universal serial bus. The CPU may configure various preset parameters in the controller 202 by modifying a host (host) file, and may even install program instructions in the controller 202 so that the MCU may implement the functions of the controller 202. In another possible implementation manner, the controller 202 may also be a CPU, and program instructions are installed in the CPU to enable the CPU to implement the functions of the controller 202. In addition, the MCU may further include a VCC port, a GND port, and the like, which are conventional ports in the MCU and will not be described herein again.

In fig. 3, each piezoceramic sensor 201 is coupled to a controller 202 and a driving circuit 203, respectively, which may be as shown in fig. 4. Meanwhile, there is also a coupling relationship between the controller 202 and the driving circuit 203.

When the user presses the touch panel 100, the pressure applied by the user on the touch panel 100 may be transmitted to the piezoceramic sensor 201, i.e., the pressure may be applied on the piezoceramic sensor 201. When a pressure is applied to the piezoelectric ceramic sensor 201, the piezoelectric ceramic sensor discharges electricity due to the piezoelectric effect, thereby generating an induction signal.

The controller 202 may control the driving circuit 203 to drive the piezoelectric ceramic sensor 201 to vibrate according to the sensing signal generated by the piezoelectric ceramic sensor 201. Specifically, the operating state of the controller 202 can be largely divided into a monitoring state and a feedback state. In general, the controller 202 may be in a default monitoring state if the touch panel 100 is not depressed. In the monitoring state, the controller 202 may continuously monitor whether one or more piezoceramic sensors 201 are receiving a sensing signal, i.e., whether the piezoceramic sensors 201 are being pressurized. Upon receiving a sensing signal generated by one or more piezo ceramic sensors 201, controller 202 may switch to a feedback state.

In the feedback state, the controller 202 may control the driving circuit 203 to drive the piezoelectric ceramic sensor 201 to vibrate. Specifically, the driver circuit 203 may also be coupled to a power supply circuit 300, and the power supply circuit 300 may provide an input voltage to the driver circuit 203. For example, the power circuit 300 may be a system power supply (PSYS) or other power supply elements in an electronic device, and the embodiments of the present application should not be limited thereto. The driving circuit 203 may convert, for example, voltage amplification, period adjustment, multiplexing, etc., the input voltage provided by the power circuit 300 under the control of the controller 202, thereby generating a driving signal capable of driving the piezoelectric ceramic sensor 201. Specifically, the driving signal may be a voltage signal, and after the driving signal is transmitted to the piezoelectric ceramic sensor 201, a certain driving voltage may be applied to the piezoelectric ceramic sensor, so that the piezoelectric ceramic sensor 201 may be driven to vibrate by the driving signal.

In one possible implementation, the controller 202 may also start timing after receiving the sensing signal. In the feedback state, if the counted time reaches a preset time threshold, such as a first time threshold, the control driving circuit 203 stops driving the piezoelectric ceramic sensor 201 to vibrate, thereby ending vibration feedback. Further, the controller 202 then switches to the monitoring state to wait for the next time the user presses the touch pad 100. The first time threshold may be a time length of one pressing operation calculated through experience, data statistics, operation simulation, and the like.

With the vibration feedback system shown in fig. 3, since the piezoelectric ceramic sensor 201 can replace the conventional capacitive sensor array and vibration motor, it is advantageous to simplify the structure of the vibration feedback system. Moreover, piezo-ceramic sensor 201 is typically less costly than a vibrating motor, and thus also contributes to reducing the cost of the vibrating feedback system. In addition, the piezoceramic sensor 201 has high sensitivity, and the user only needs to slightly press the touch pad 100, so that the piezoceramic sensor 201 can vibrate, and the reduction of the pressing deformation of the touch pad 100 is facilitated. Finally, under the condition that the plurality of piezoelectric ceramic sensors 201 are arranged in an array under the touch panel 100, when a user presses any position on the touch panel 100, the user can feel the vibration fed back by the touch panel 100, so that the problem of false pressing is reduced, and the use experience of the user is improved.

By adopting the vibration feedback system provided by the embodiment of the application, when the user presses the touch pad 100, the piezoelectric ceramic sensor 201 applied with pressure can generate vibration, so that the pressing position of the user can be consistent with the position for feeding back the vibration. It is understood that when a user presses the touch pad 100, pressure may be applied to either one piezo ceramic sensor 201 or a plurality of piezo ceramic sensors 201. Therefore, in the vibration feedback system provided in the embodiment of the present application, the controller 202 may simultaneously receive the sensing signals generated by the one or more piezoceramic sensors 201, and control the driving circuit to generate the driving signal so as to simultaneously drive the one or more piezoceramic sensors 201 to vibrate.

Next, the controller 202 and the driving circuit 203 provided in the embodiment of the present application are further described as an example.

Example one

Fig. 5 illustrates a schematic diagram of a possible vibration feedback system. The vibration feedback system comprises N piezoelectric ceramic sensors P1, P2, … … and PN, wherein N is larger than or equal to 1.

In the embodiment of the present application, the controller 202 may keep monitoring the P1 to PN in the monitoring state, so as to switch to the feedback state in time in the case that the piezo ceramic sensor in the P1 to PN generates the sensing signal. Specifically, the controller 202 may implement the monitoring of P1 through PN in at least one of the following two ways.

Implementation mode one

As shown IN FIG. 5, the N piezo-ceramic sensors are connected IN parallel, with one side of the positive parallel coupled to the IN + port of the controller 202 and the other side of the negative parallel coupled to the IN-port of the controller 202. IN the monitoring state, the controller 202 may monitor a voltage value of one side of the P1 to PN positive electrode parallel connection through the IN + port and a voltage value of the other side of the P1 to PN negative electrode parallel connection through the IN-port, so that a voltage value of the P1 to PN parallel connection voltage may be obtained from a difference of the voltage values monitored through the IN + port and the IN-port.

Specifically, when the piezoelectric ceramic sensor generates the sensing signal, the voltage difference between the positive electrode and the negative electrode of the piezoelectric ceramic sensor increases, and thus the parallel voltage from P1 to PN increases. Therefore, when the controller 202 determines that the voltage value of the parallel voltage from P1 to PN is large through the IN + port and the IN-port, it can be determined that the piezo ceramic sensor is pressed IN P1 to PN, that is, the controller 202 receives the sensing signal.

In one possible implementation, a preset voltage threshold, such as a first voltage threshold, may be configured in the controller 202. The controller 202 may determine that there is a piezo ceramic sensor among P1 through PN that pressure is applied when it is determined that the voltage value of the parallel voltage of P1 through PN is greater than the first threshold. The magnitude of the first voltage threshold may be obtained according to the operating parameter of the piezo-ceramic sensor and the estimated minimum degree of pressing of the user, for example, the estimated minimum degree of pressing of the user is 1N (unit: newton, cow), the voltage value of the sensing signal generated by the piezo-ceramic sensor when 1N of pressing force is applied is 3mV, and the first voltage threshold may be set to 3 mV. Through setting up the first voltage threshold value of reasonable size, can reduce the vibrations feedback under the scene is touched to the mistake to reduce electronic equipment's consumption.

In the embodiment of the present application, the controller 202 may be an MCU, in which case, as shown in fig. 5 for example, the controller 202 may further include a serial data line (SDA) port and a Serial Clock Line (SCL) port. The controller 202 is connected to the CPU through the SDA port and the SCL port so that the CPU can configure preset parameters for the controller 202. For example, the first voltage threshold may be configured by the CPU of the electronic device for the controller 202, and other preset parameters in the subsequent embodiments may also be configured by the CPU for the controller 202, which is not described herein again.

It will be appreciated that there is a certain noise signal in the sensing signal generated by the piezo-ceramic sensor, which may interfere with the detection of the voltage level of the P1 to PN parallel voltage by the controller 202. IN view of this, the sensing signal generated by the piezoelectric ceramic sensor may be filtered by a low-pass filter circuit (e.g., a low-pass filter circuit formed by R1 and C1 IN fig. 5), so as to filter a high-frequency noise signal IN the sensing signal, and then the filtered sensing signal is provided to the IN + port and the IN-port, so that the IN + port and the IN-port may monitor a voltage value of the sensing signal more accurately.

Taking the side of the N piezoelectric ceramic sensors with the anodes connected in parallel as an example, the anodes of the N piezoelectric ceramic sensors are respectively coupled with the N low-pass filter circuits. As shown in FIG. 5 for piezoceramic sensor P1, piezoceramic sensor P1 is coupled to a low pass filter circuit formed by resistor R1 and capacitor C1. Wherein the positive pole of the piezoceramic sensor P1 is coupled to one end of the resistor R1. The other end of the resistor R1 is coupled to the positive terminal of the capacitor C1. The cathode of the capacitor C1 is coupled to the IN + port of the controller 202.

The low-pass filter circuit formed by the resistor R1 and the capacitor C1 can filter out high-frequency signals IN the sensing signal generated by the piezoceramic sensor P1, and provide the filtered sensing signal to the IN + port of the controller 202, so that the controller 202 can monitor a more accurate voltage value of the sensing signal through the IN + port.

Implementation mode two

As shown in fig. 5, the controller 202 includes N sensing ports, such as FT ports (FT1 to FTN), the positive poles of P1 to PN are respectively coupled to the N FT ports of the controller 202 in a one-to-one correspondence, and the negative poles of P1 to PN are connected in parallel to maintain equal potentials. In the monitoring state, the controller 202 may monitor the voltage values of the positive voltages of P1 to PN through the N FT ports, respectively. When one or more FT ports in the N FT ports monitor high voltage, the piezoelectric ceramic sensor corresponding to the FT port monitoring the high voltage can be determined to generate an induction signal. For example, the controller 202 may compare the voltage values monitored through the N FT ports with a preset voltage threshold, such as a second voltage threshold, and may determine that a certain FT port monitors a high voltage if the voltage value monitored through the FT port is greater than the second voltage threshold. By adopting the implementation mode, whether the induction signal is generated or not can be monitored, and which specific piezoelectric ceramic sensor generates the induction signal can be monitored.

It should be noted that the first implementation and the second implementation can be used in combination. For example, the voltage values of the parallel voltages from P1 to PN can be monitored through the IN + port and the IN-port, so that whether the piezoelectric ceramic sensor generates the sensing signal can be monitored accurately. When it is determined that the piezo ceramic sensor generates the sensing signal, a target sensor, which may be a piezo ceramic sensor generating the sensing signal, is determined from P1 to PN through the voltage values detected by the N FT ports, so that the controller 202 may control the driving circuit 203 to drive the target sensor to vibrate in a targeted manner in a subsequent feedback state.

Example two

The controller 202 may switch to the feedback state upon detecting the sensing signal, i.e., determining that the piezo ceramic sensor is pressurized at P1 through PN. In the feedback state, the controller 202 may control the driving circuit 203 to generate the driving signal. In the embodiment of the present application, the driving signal may be obtained by the driving circuit 203 based on the input voltage provided by the power supply circuit 300. As shown in fig. 5, the driving circuit 203 may include a boosting unit 2031, an input terminal of the boosting unit 2031 is coupled to the power supply circuit 300, an output terminal of the boosting unit 2031 is coupled to the piezoceramic sensors P1 to PN, and a control terminal of the boosting unit 2031 is coupled to the controller 202. The boosting unit 2031 may boost an input voltage provided by the power circuit 300 upon receiving the first control signal provided by the controller 202, thereby generating a driving signal capable of driving the piezo ceramic sensor to vibrate.

Next, the boosting unit 2031 provided in the embodiment of the present application will be further described.

In this embodiment, the boosting unit 2031 has many possible implementations, for example, it can be implemented by a boost (boost) boosting circuit, a multi-voltage boosting circuit, and other common boosting circuits, which are not described in detail herein. In a possible implementation, the boost unit may also be implemented by a combination of various types of boost circuits, and fig. 6 illustrates an example of one possible implementation.

As shown in fig. 6, the boosting unit 2031 is formed by combining one boost boosting circuit and three voltage multiplying circuits. Specifically, the boost circuit includes an inductor L1, a diode Da, a capacitor Cc, and a transistor Q1. One end of the inductor L1 may be coupled to the power circuit 300 as an input terminal of the voltage boost unit 2031, and may receive an input voltage provided by the power circuit 300, that is, the input voltage Vi, and the other end of the inductor L1 is coupled to an anode of the diode Da and the first electrode of the transistor Q1, respectively. The cathode of the diode Da is coupled to the first electrodes of the voltage multiplying circuit and the capacitor Cc, respectively. A second electrode of transistor Q1 and a second electrode of capacitor Cc are coupled to ground. The control electrode of transistor Q1 may be coupled as the control terminal of the boost unit 2031 to the PWM2 port in the controller 202.

The controller 202, after switching to the feedback state, may send a first control signal through the PWM2 port to the control electrode of the transistor Q1, which may turn on the transistor Q1. In the process of a vibration feedback, the controller 202 is required to periodically send a plurality of first control signals, that is, the transistor Q1 is periodically turned on for a plurality of times, so that the boost circuit alternately boosts the boost voltage by charging and discharging, and the output voltage Vo of the boost circuit 2031 can reach the preset second threshold.

Illustratively, as shown in fig. 7, at the beginning time point of one period T, the controller 202 sends a first control signal to turn on the transistor Q1. In this case, the input voltage Vi may charge the inductor L. After the time length for continuously transmitting the first control signal reaches T1, the controller 202 stops transmitting the first control signal, and turns off the transistor Q1. In this case, the input voltage Vi and the inductor L simultaneously charge the capacitor Cc, so that the capacitor Cc can obtain a voltage larger than the input voltage Vi, and thus a first voltage larger than the input voltage Vi can be output to the voltage-multiplying circuit at the next discharging, that is, boosting is realized. After the transistor Q1 is turned off for a time period T2, the starting time of the next cycle is reached, and the controller 202 repeats the above process until the vibration feedback is finished.

It should be noted that the voltage value of the first voltage output by the boost circuit is related to the ratio of T1 and T, wherein the ratio of T1 and T can also be understood as the duty ratio of the first control signal. In a specific implementation, the duty ratio of the first control signal may be configured in the controller 202 in advance, and after the controller 202 switches to the feedback state, the first control signal may be periodically sent to the transistor Q1 according to the preset duty ratio of the first control signal.

The voltage-multiplying circuit can further boost the first voltage output by the boost circuit. For example, in the multi-voltage circuit shown in fig. 6, the anode of the diode Db may receive the first voltage provided by the boost circuit, the cathode of the diode Db is coupled to the anode of the diode Dc and the first electrode of the capacitor Cb, respectively, the second electrode of the capacitor Cb is coupled to the anode of the diode Da, the cathode of the diode Dc is coupled to the first electrode of the capacitor Cd, and the second electrode of the capacitor Cd is grounded. The cathode of the diode Dd is coupled to the first electrode of the capacitor Ca and the anode of the diode De, respectively, the second electrode of the capacitor Ca is coupled to the anode of the diode Da, the cathode of the diode De is coupled to the first electrode of the capacitor Ce, the cathode of the diode De may also be coupled to the piezoelectric ceramic sensors P1 to PN as the output terminal of the voltage boosting unit 2031, and the second electrode of the capacitor Ce is grounded.

The multiple voltage circuit shown in fig. 6 is a triple voltage circuit, and can triple the first voltage output by the boost circuit. For example, the input voltage Vi is 12V, and is amplified by the boost circuit to output a first voltage having a voltage value of 140V. The voltage multiplying circuit boosts the first voltage, and the output voltage Vo can reach 420V.

It can be understood that the boost voltage boost circuit has a high voltage boost capability, but has a high requirement on the electrical parameters of the capacitor Cc and the inductor L1. In the case that the boost circuit output voltage is high, the capacitor Cc and the inductor L1 occupy a large space, and the electrical lifetime is short. The multi-voltage circuit is simple in structure and small in occupied space. In the implementation manner of the boosting unit 2031 shown in fig. 6, the number of diodes and capacitors in the multi-voltage circuit can be flexibly set according to the requirements on the size of the occupied space of the boosting unit 2031, the boosting capability, and the like. The boost circuit and the multi-voltage circuit are used in combination, so that the space occupied by the boost circuit is reduced, and higher output voltage is output, and the effect of taking the two factors of the occupied space and the boosting capacity of the boosting unit 2031 into consideration is achieved.

As shown in fig. 5, the driving circuit 203 provided in the embodiment of the present application may include N switching units, where N is greater than or equal to 1. And, the output terminals of the N switch units are coupled with the N piezoceramic sensors in a one-to-one correspondence respectively, as in the switch units 1 to N in fig. 5. Taking switch unit 1 as an example, the input terminal of switch unit 1 is coupled to the output terminal of voltage boosting unit 2031, the output terminal of switch unit 1 is coupled to the positive electrode of piezoceramic sensor P1, and the control terminal of switch unit 1 is coupled to the open port in controller 202.

After receiving the sensing signal, the controller 202 may immediately send a third control signal to one or more of the N switching units to turn on the transmission path of the driving signal, or the controller 202 may first send the first control signal to the voltage boosting unit 2031 to boost the input voltage by the voltage boosting unit 2031, and after the output voltage of the voltage boosting unit 2031 reaches a preset voltage threshold, for example, after the third voltage threshold, send the third control signal to one or more of the switching units to turn on the transmission path of the driving signal by the switching unit receiving the third control signal.

Specifically, as for boosting unit 2031 shown in fig. 6, boosting unit 2031 needs a certain time delay after being turned on to boost the input voltage supplied from power supply circuit 300 to a level at which the piezoelectric ceramic sensor can be driven. If the transmission path of the drive signal is turned on before the output voltage of booster 2031 reaches the third voltage threshold, the voltage of the drive signal may be too low, and the vibration of the piezoelectric ceramic sensor may be insignificant.

In view of this, in one possible implementation, as shown in fig. 5, the controller 202 may also include an FB port. The FB port is coupled to the boosting unit 2031, and the controller 202 may monitor a voltage value of the output voltage Vo of the boosting unit 2031 through the FB port. When the voltage value of the output voltage Vo of the voltage boosting unit 2031 reaches a preset voltage threshold, for example, a third voltage threshold, the controller 202 may turn on one or more of the switching units 1 to N by a third control signal, so that the voltage boosting unit 2031 may output an output voltage with a voltage value of the third voltage threshold, that is, a driving signal, to one or more piezoelectric ceramic sensors therein, thereby driving one or more of the piezoelectric ceramic sensors P1 to PN to vibrate.

Since the output voltage Vo of the boosting unit 2031 is high, in order to protect the controller 202 from being damaged, a voltage dividing unit 2033 may be further provided between the boosting unit 2031 and the FB port. An input terminal of the voltage dividing unit 2033 is coupled to an output terminal of the voltage boosting unit 2031, and an output terminal of the voltage dividing unit 2033 is coupled to the FB port of the controller 202. The voltage dividing unit 2033 may reduce the output voltage of the boosting unit by a certain voltage dividing ratio, and the controller 202 may detect the voltage value of the input voltage provided by the voltage dividing unit 2033, and may determine the voltage value of the output voltage of the boosting unit 2031 based on the detected voltage value of the input voltage and a preset voltage dividing ratio.

For example, the structure of the voltage dividing unit 2033 may be as shown in fig. 8. The voltage dividing unit 2033 includes a resistor Ra and a resistor Rb. One end of the resistor Ra is coupled to the voltage boosting unit as an input end of the voltage dividing unit 2033; the other end of the resistor Ra is coupled to one end of the resistor Rb, and is coupled to the FB port of the controller 202 as an output end of the voltage dividing unit 2033; the other end of the resistor Rb is grounded. The voltage value monitored by the FB port satisfies the following formula:

wherein, U_FBR1 is the resistance value of resistor Ra, r2 is the resistance value of resistor Rb, U is the voltage value monitored by FB port₁Is a voltage value of the output voltage Vo of the boosting unit 2031.

After the controller 202 turns on one or more of the switching units 1 to N, the boosting unit 2031 may continuously output the driving signal having the stable voltage. During the on period of the switching unit, the controller 202 may keep periodically sending the first control signal to maintain the piezo-ceramic sensor to stably vibrate. After the vibration feedback is finished, the controller 202 may stop sending the first control signal.

Further, in one possible implementation, the driving circuit 203 may further include a power supply control unit 2035. The power control unit 2035 has an input coupled to the power circuit 300, an output coupled to the voltage boost unit 2031, and a control coupled to the PWM1 port of the controller 202. After the controller 202 switches to the feedback state, the power control unit 2035 may be turned on by the second control signal first, so that the input voltage provided by the power circuit 300 may be transmitted to the voltage boost unit 2031. The controller 202 turns on the voltage boosting unit 2031 by the first control signal, so that the voltage boosting unit 2031 boosts the input voltage provided by the power supply circuit 300.

The power control unit 2035 is disposed in the driving circuit 203, so that the controller 202 can disconnect the transmission path between the power circuit 300 and the voltage boost unit 2031 when in the monitoring state, thereby being beneficial to reducing the power consumption of the electronic device and prolonging the standby time length of the electronic device.

For example, the structure of the power control unit 2035 may be as shown in fig. 9. A first electrode of the transistor T51 may be coupled to the power circuit 300 as an input terminal of the power control unit 2035, a first electrode of the transistor T51 may be coupled to a first electrode of the capacitor C51 and one end of the resistor 51, a second electrode of the transistor T51 may be coupled to an input terminal of the voltage boosting unit 2031 as an output terminal of the power control unit 2035, and a control electrode of the transistor T51 and the other end of the resistor 51 are coupled to a first electrode of the transistor T52 in parallel. A second electrode of the transistor T52 is coupled to one terminal of the resistor R52, and a control electrode of the transistor T52 may be coupled to the PWM1 port of the controller 202 as a control terminal of the power control unit 2035. The other end of the resistor R52 is connected to ground. The other end of the resistor 51 is also coupled to a first electrode of a capacitor C52, and a second electrode of the capacitor C52 and a second electrode of the capacitor C51 are both grounded.

Based on the power control unit 2035 shown in fig. 9, the controller 202 may send a second control signal to the control electrode of the transistor T52 through the PWM1 port. The transistor T52 may be an NPN transistor, and the transistor T52 is turned on upon receiving the second control signal of the high level. In this case, the power supply current provided by the power supply circuit 300 may be divided to the ground by the resistor R52 through the resistor R51 and the transistor T52. A voltage difference is formed between two ends of the resistor R51, so that the transistor T51 can be turned on, and the input voltage provided by the power circuit 300 can be transmitted to the voltage boosting unit 2031.

It is to be understood that the present embodiment does not limit the order in which the controller 202 sends the first control signal and the second control signal. For example, the controller 202 may first send a first control signal to turn on the boosting unit 2031 and then send a second control signal to turn on the power control unit 2035. Boosting unit 2031 can boost the input voltage after receiving the input voltage. For another example, taking power supply control section 2035 shown in fig. 9 as an example, power supply control section 2035 needs a certain time delay to turn on the transmission path between the power supply circuit and boosting section 2031 after receiving the second control signal. In view of this, in a possible implementation, the controller 202 may further turn on the boosting unit 2031 after a preset time length for sending the second control signal, such as a second time length threshold, by the controller 202.

EXAMPLE III

The input voltage supplied from the power supply circuit 300 is boosted by the boosting unit 2031, so that a driving signal having a higher voltage value can be obtained. As mentioned above, in the embodiment of the present application, the driving circuit 203 may further include N switching units, and the controller 202 may control transmission of the driving signal to the piezoceramic sensor through the N switching units.

In a possible implementation manner, the controller 202 may further control, through the N switching units, on and off of transmission paths through which the driving signals are respectively transmitted to the N piezoceramic sensors, that is, the controller 202 controls, through the switching units, to drive one or more of the N piezoceramic sensors to vibrate.

Next, the switch unit provided in the embodiment of the present application is further described.

In one possible implementation, the controller 202 may include N open ports, which are respectively coupled to the control terminals of the N switch units. In this case, the switch unit may be a transistor, and the controller 202 may turn on the switch unit coupled to the target transistor and turn off the other switch units by outputting the high-voltage third control signal and the low-voltage third control signal at the N open ports, respectively. For example, the piezo-ceramic sensor P1 is a target sensor, and the piezo-ceramic sensors P2 to PN are not target sensors. The switch units 1 to N may be NMOS (N-metal-oxide-semiconductor) transistors. In this case, the controller 202 may output the third control signal of a high voltage through the open port coupled to the switching unit 1, and output the third control signal of a low voltage (or not output the third control signal) from the other open port, so that only the switching unit 1 may be turned on, so that the driving signal output from the boosting unit 2031 may be transmitted to the piezo-ceramic sensor P1, and the piezo-ceramic sensor P1 may be driven to vibrate.

In another possible implementation, as shown in fig. 5, the controller 202 may control N switch units through only one open (open) port, so as to save ports of the controller 202. Specifically, the structure of the switching unit may be as shown in fig. 10. Taking the switch unit 1 in fig. 10 as an example, the switch unit 1 includes a transistor 1a, a transistor 1b, and a resistor 1R. A first electrode of the transistor 1a may be coupled as an input terminal of the switching unit 1 to the voltage boost unit 2031, a second electrode of the transistor 1a may be coupled as an output terminal of the switching unit 1 to the anode of the piezoceramic sensor P1, a control electrode of the transistor 1a is coupled to a first electrode of the transistor 1b, and a resistor 1R is further coupled between the first electrode and the control electrode of the transistor 1 a. A second electrode of the transistor 1b is coupled to the FT1 port of the controller 202, and a control electrode of the transistor 1b may be coupled as a control terminal of the switching unit 1 to the open port of the controller 202. The other switch units have a similar structure to the switch unit 1, and a detailed description thereof is omitted.

Assuming that the transistor 1a is a PNP transistor and the transistor 1b is an NPN transistor, the piezo-ceramic sensor P1 is taken as an example of a target sensor. The controller 202 may determine that the piezo ceramic sensor P1 is the target sensor through the voltage monitored at the FT1 to FTN ports in the monitoring state. After switching to the feedback state, the controller 202 may apply a low voltage (e.g., 0V) to the second electrode of the transistor 1b through the FT1 port and a high voltage (e.g., 3V) through the FT2 to the FTN port.

In this case, the controller 202 may output a third control signal through the open port having a voltage value between the high voltage of the FT1 port and the low voltages of the other FT ports, such as 2V. Since the transistor 1b is a PNP transistor, the voltage of the control electrode is higher than the voltage of the second electrode, and thus the transistor 1b is turned on. The transistor b of the other switch unit, which functions similarly as the transistor 1b (e.g. the transistor 2b of the switch unit 2, etc.), remains off.

When the transistor 1b is turned on, the resistor 1R will act as a voltage drop, so that the voltage of the control electrode of the transistor 1a is lower than the voltage of the first electrode of the transistor 1 a. Since the transistor 1a is an NPN transistor, the transistor 1a is turned on, so that the driving signal output by the voltage boosting unit 2031 can be transmitted to the piezoceramic sensor P1, thereby achieving the effect of driving the piezoceramic sensor P1 to vibrate in a targeted manner.

Note that when the transistor 1b is turned on, the connection between the voltage boosting unit 2031 and the FT1 port of the controller 202 is also turned on. In order to prevent the high voltage output by the voltage boosting unit 2031 from damaging the controller 202, as shown in fig. 10, a protection resistor Rs may be further coupled between the second electrode of the transistor 1b and the FT1 port of the controller 202 to improve the safety of the controller 202. Similarly, protection resistors may be coupled between other switch units and the corresponding FT ports, which is not described in detail herein.

As described above, the controller 202 controls the driving circuit 203 to stop driving the target sensor to vibrate after the time length from receiving the sensing signal reaches the preset first time length threshold. For example, the controller 202 may stop outputting the third control signal from the open port, so that the switch unit coupled to the target sensor is turned off and the target sensor may stop vibrating.

After the switch unit is turned off, a certain amount of residual charge may still exist between the boosting unit 2031 and the switch unit 1, and the residual charge may accelerate the circuit degradation. Thus, the circuit can also be initialized at the end of the shock feedback. Illustratively, as shown in fig. 5, the driving circuit 203 further includes a discharging unit 2034. The input terminal of the discharging unit 2034 is coupled to the output terminal of the boosting unit 2031 and the input terminals of the switching units 1 to N, respectively, the output terminal of the discharging unit 2034 is grounded, and the control terminal of the discharging unit 2034 is coupled to the close port of the controller 202. The controller 202 may output a fourth control signal through the close port to turn on the discharging unit 2034 after the vibration feedback is ended. After the discharging unit 2034 is turned on, residual charges between the boosting unit 2031 and the switching unit 1 may be discharged to the ground through the discharging unit 2034.

In addition, the discharge unit 2034 may be turned on to end the vibration feedback. That is, when the vibration feedback is finished, the controller 202 may turn off the switch unit coupled to the target sensor, turn on the discharging unit 2034 while turning off the switch unit coupled to the target sensor, and so on.

In one possible implementation, the controller 202 may further start timing after the discharge unit 2034 is started, and the controller 202 turns off the discharge unit 2034 when the time length of the discharge unit 2034 for continuous discharge reaches a preset time threshold, such as a third time threshold.

For example, the structure of the discharge unit 2034 may be as shown in fig. 11. The discharge unit 2034 includes a resistor R41, a transistor Q4, and a resistor R42. One end of the resistor R41 may be coupled to the output terminal of the voltage boosting unit 2031 and the input terminals of the switching units 1 to N as the input terminal of the discharging unit 2034, and the other end of the resistor R41 is coupled to the first electrode of the transistor Q4. A second electrode of the transistor Q4 is coupled to one terminal of the resistor R42, and a control electrode of the transistor Q4 may be coupled to a close port of the controller 202 as a control terminal of the discharge unit 2034. The other end of the resistor R42 is connected to ground. The controller 202 may send a fourth control signal to the control electrode of the transistor Q4 through the close port, and the fourth control signal may turn on the transistor Q4, so that the resistor R41, the transistor Q4, and the resistor 42 form a ground path of the voltage boosting unit 2031, and thus residual charges between the voltage boosting unit 2031 and the switch units 1 to N may be transferred to the ground through the ground path, which achieves an effect of releasing the residual charges to the ground, so as to initialize the circuit.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. An electronic device, comprising: the piezoelectric ceramic sensor comprises a touch panel, a piezoelectric ceramic sensor, a driving circuit, a power circuit and a controller; wherein the controller is respectively coupled with the piezoelectric ceramic sensor and the driving circuit, and the piezoelectric ceramic sensor is coupled with the driving circuit; the touch panel is in direct or indirect contact with the piezoelectric ceramic sensor; the power circuit is coupled with the driving circuit; the driving circuit comprises a boosting unit and a link control unit which are connected in series, the boosting unit and the link control unit which are connected in series are arranged between the power circuit and the piezoelectric ceramic sensor, and the boosting unit and the link control unit are respectively coupled with the controller;

the power supply circuit is used for providing input voltage for the driving circuit;

the touch pad is used for transmitting the pressure applied by a user on the touch pad to the piezoelectric ceramic sensor;

the piezoelectric ceramic sensor is used for generating a sensing signal after receiving the pressure transmitted by the touch panel;

the controller is used for sending a first control signal to the boosting unit and sending a link control signal to the link control unit after receiving the induction signal generated by the piezoelectric ceramic sensor;

the boosting unit is used for: after receiving the first control signal, performing a boosting operation on an input voltage provided by the power supply circuit to obtain a driving signal; the link control unit is configured to: after receiving the link control signal, conducting a transmission path between the power circuit and the piezoelectric ceramic sensor; the driving signal is used for driving the piezoelectric ceramic sensor to generate vibration, so that the user can sense the vibration through the touch panel;

when the electronic equipment comprises a plurality of piezoelectric ceramic sensors, the controller comprises a plurality of induction ports, the induction ports are respectively coupled with the anodes of the piezoelectric ceramic sensors in a one-to-one correspondence mode, and the cathodes of the piezoelectric ceramic sensors are connected in parallel;

the controller is further configured to: respectively acquiring voltage values of the positive voltages of the piezoelectric ceramic sensors through the plurality of induction ports; and determining the piezoelectric ceramic sensor with the voltage value of the positive voltage being greater than the preset voltage value in the plurality of piezoelectric ceramic sensors as a target piezoelectric ceramic sensor, and controlling the driving circuit to generate the driving signal, wherein the driving signal is used for driving the target piezoelectric ceramic sensor to generate vibration.

2. The electronic device of claim 1, wherein the link control unit is a power control unit, and the link control signal is a second control signal; the input end of the power supply control unit is coupled with the power supply circuit, the output end of the power supply control unit is coupled with the input end of the boosting unit, and the output end of the boosting unit is coupled with the piezoelectric ceramic sensor;

the power control unit is used for: after receiving the second control signal, turning on a transmission path between the power supply circuit and the boosting unit.

3. The electronic device of claim 1, wherein the link control unit is a switch unit, and the link control signal is a third control signal; the input end of the boosting unit is coupled with the power supply circuit, the output end of the boosting unit is coupled with the input end of the switch unit, and the output end of the switch unit is coupled with the piezoelectric ceramic sensor;

the switch unit is used for: after receiving the third control signal, turning on a transmission path between the boosting unit and the piezoceramic sensor.

4. The electronic device according to claim 3, wherein the driving circuit comprises a plurality of switching units, and output ends of the plurality of switching units are respectively coupled with the plurality of piezoceramic sensors in a one-to-one correspondence manner;

the controller sends a third control signal to the switch unit, specifically: the controller sends the third control signal to a target switch unit of the plurality of switch units, the target switch unit is a switch unit of the plurality of switch units, which is correspondingly coupled with a target sensor, and the target sensor is a sensor of the plurality of piezoelectric ceramic sensors, which generates the induction signal.

5. The electronic device according to claim 4, wherein any one of the plurality of switching units includes a first transistor, a second transistor, and a first resistor;

a first electrode of the first transistor is coupled with the boosting unit, a second electrode of the first transistor is coupled with the corresponding piezoelectric ceramic sensor of the switch unit, and a control electrode of the first transistor is coupled with a first electrode of the second transistor;

a second electrode of the second transistor is coupled with a first sensing port of the plurality of sensing ports, the first sensing port is a sensing port coupled with a piezoelectric ceramic sensor corresponding to the switch unit, and a control electrode of the second transistor is coupled with an opening port of the controller;

one end of the first resistor is coupled with a first electrode of the first transistor, and the other end of the first resistor is coupled with a control electrode of the first electrode;

the controller sends the third control signal to a target switch unit of the plurality of switch units, specifically: the controller outputs a first voltage from the induction port corresponding to the target sensor and outputs a second voltage from other induction ports except the induction port corresponding to the target sensor; outputting the third control signal from the open port, a voltage value of the third control signal being between a voltage value of the first voltage and a voltage value of the second voltage.

6. The electronic device according to claim 5, wherein the first transistor is a PNP transistor, the second transistor is an NPN transistor, and a voltage value of the first voltage is smaller than a voltage value of the second voltage.

7. The electronic device of any of claims 3-6, wherein the controller is further coupled with an output of the boost unit;

the controller is further configured to: before the third control signal is sent to the switching unit, the voltage value of the output voltage of the boosting unit is obtained; and after the voltage value of the output voltage of the boosting unit reaches a preset voltage threshold value, sending the third control signal to the switching unit.

8. The electronic device of claim 7, wherein the driving circuit further comprises a voltage dividing unit, an input terminal of the voltage dividing unit is coupled to the voltage boosting unit, and an output terminal of the voltage dividing unit is coupled to the controller, and the voltage dividing unit is configured to divide the output voltage of the voltage boosting unit according to a voltage dividing ratio;

the controller acquires a voltage value of the output voltage of the boosting unit, specifically: the controller detects a voltage value of the input voltage provided by the voltage dividing unit; and calculating to obtain the voltage value of the output voltage of the boosting unit according to the voltage value of the input voltage and the voltage division ratio.

9. The electronic device of any of claims 3-6, wherein the controller is further configured to:

starting timing after receiving at least one induction signal generated by the at least one piezoelectric ceramic sensor;

and stopping sending the third control signal to the switch unit after the timing reaches a preset time length threshold value.

10. The electronic device of claim 9, wherein the driving circuit further comprises a discharging unit, an input terminal of the discharging unit is coupled to the output terminal of the boosting unit and the input terminal of the switching unit, respectively, an output terminal of the discharging unit is grounded, and a control terminal of the discharging unit is coupled to the controller;

the controller is further configured to: transmitting a fourth control signal to the discharging unit after stopping transmitting the third control signal to the switching unit;

the discharge unit is used for: after receiving the fourth control signal, turning on a transmission path between the boosting unit and the switching unit and ground.

11. The electronic device according to any one of claims 1 to 6, wherein the boosting unit includes a boost boosting circuit and a multi-voltage circuit;

an input end of the boost circuit is coupled with the power supply circuit, an output end of the boost circuit is coupled with an input end of the voltage-multiplying circuit, and a control end of the boost circuit is coupled with the controller;

the boost circuit is used for boosting the input voltage provided by the power supply circuit after receiving the first control signal and providing the boosted input voltage to the voltage-multiplying circuit;

the output end of the multi-voltage circuit is coupled with the piezoelectric ceramic sensor;

the voltage multiplying circuit is used for boosting the boosted input voltage provided by the boost circuit to obtain the driving signal.

12. A vibration feedback system applied to an electronic apparatus including a touch panel and a power supply circuit, comprising: the piezoelectric ceramic sensor, the drive circuit and the controller; wherein the controller is respectively coupled with the piezoelectric ceramic sensor and the driving circuit, and the piezoelectric ceramic sensor is coupled with the driving circuit; the touch panel is in direct or indirect contact with the piezoelectric ceramic sensor; the power circuit is coupled with the driving circuit;

the controller is used for controlling the driving circuit to adjust the input voltage output by the power supply circuit to generate a driving signal after receiving the sensing signal generated by the piezoelectric ceramic sensor, wherein the driving signal is used for driving the piezoelectric ceramic sensor to generate vibration so that the user can sense the vibration through the touch panel;

when the electronic device comprises a plurality of piezoelectric ceramic sensors, the controller comprises a plurality of induction ports, the induction ports are respectively coupled with the anodes of the piezoelectric ceramic sensors in a one-to-one correspondence manner, and the cathodes of the piezoelectric ceramic sensors are connected in parallel;

the controller is further configured to: respectively acquiring voltage values of the positive voltages of the piezoelectric ceramic sensors through the plurality of induction ports; determining a piezoelectric ceramic sensor with a voltage value of a positive electrode voltage larger than a preset voltage value in the plurality of piezoelectric ceramic sensors as a target sensor, and controlling the driving circuit to generate the driving signal, wherein the driving signal is used for driving the target piezoelectric ceramic sensor to generate vibration;

the driving circuit comprises a boosting unit and a link control unit which are connected in series, the boosting unit and the link control unit which are connected in series are arranged between the power circuit and the piezoelectric ceramic sensor, and the boosting unit and the link control unit are also respectively coupled with the controller;

the controller controls the driving circuit to generate a driving signal, specifically: the controller sends a first control signal to the boosting unit and sends a link control signal to the link control unit;

the boosting unit is used for: after receiving the first control signal, performing a boosting operation on an input voltage provided by the power supply circuit to obtain the driving signal;

the link control unit is configured to: and after receiving the link control signal, conducting a transmission path between the power supply circuit and the piezoelectric ceramic sensor.

13. The vibration feedback system of claim 12 wherein the link control unit is a power control unit and the link control signal is a second control signal; the input end of the power supply control unit is coupled with the power supply circuit, the output end of the power supply control unit is coupled with the input end of the boosting unit, and the output end of the boosting unit is coupled with the piezoelectric ceramic sensor;

14. The vibration feedback system of claim 12 wherein the link control unit is a switch unit and the link control signal is a third control signal; the input end of the boosting unit is coupled with the power supply circuit, the output end of the boosting unit is coupled with the input end of the switch unit, and the output end of the switch unit is coupled with the piezoelectric ceramic sensor;

15. The vibration feedback system according to claim 14, wherein the driving circuit comprises a plurality of switching units, and output terminals of the plurality of switching units are respectively coupled to the plurality of piezoceramic sensors in a one-to-one correspondence;

16. The vibration feedback system of claim 14 wherein any one of a plurality of switching units, said switching unit comprising a first transistor, a second transistor and a first resistor;

17. The vibration feedback system according to claim 16, wherein the first transistor is a PNP transistor, the second transistor is an NPN transistor, and the voltage value of the first voltage is smaller than the voltage value of the second voltage.

18. The vibratory feedback system of any one of claims 14-17 wherein the controller is further coupled to an output of the booster unit;

19. The vibration feedback system according to claim 18, wherein the driving circuit further comprises a voltage dividing unit, an input terminal of the voltage dividing unit is coupled to the voltage boosting unit, an output terminal of the voltage dividing unit is coupled to the controller, and the voltage dividing unit is configured to divide the output voltage of the voltage boosting unit according to a voltage dividing ratio;

20. The vibratory feedback system of any one of claims 14-17 wherein the controller is further configured to:

21. The vibration feedback system according to claim 20, wherein the driving circuit further comprises a discharging unit, an input terminal of the discharging unit is coupled to the output terminal of the boosting unit and an input terminal of the switching unit, respectively, an output terminal of the discharging unit is grounded, and a control terminal of the discharging unit is coupled to the controller;

22. The vibration feedback system according to any one of claims 12 to 17, wherein the booster unit includes a boost booster circuit and a multi-voltage circuit;