CN110262676B - Resonance signal adjusting device, electromagnetic pen and electromagnetic handwriting screen system - Google Patents
Resonance signal adjusting device, electromagnetic pen and electromagnetic handwriting screen system Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
- G06F3/0383—Signal control means within the pointing device
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
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- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
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Abstract
A resonance signal adjusting device, an electromagnetic pen and an electromagnetic handwriting screen system comprise a tuning module, a frequency detection module and a control module. The frequency detection module generates a frequency counting signal according to the resonance signal and the zero clearing signal, the control module generates the zero clearing signal and the frequency adjustment signal according to the frequency counting signal, the resonance parameter generated by the tuning module is automatically adjusted to generate the frequency of the resonance signal to be located in a first preset interval, the automatic adjustment of the resonance frequency is realized, the emitting frequency of the active electromagnetic pen is adjusted, the defect that the element parameter deviation and the using environment factor influence the resonance emitting frequency of the electromagnetic pen is avoided, and therefore the defects of low writing position coordinate precision and large pen pressure detection error of the electromagnetic pen are caused, the writing pressure sensing precision and writing resolution of the electromagnetic pen are improved, the writing coordinate positioning is accurate, writing has no delay trailing, the handwriting reduction degree is close to real handwriting, and the user experience degree is excellent.
Description
Technical Field
The invention belongs to the technical field of electronic information input equipment, and particularly relates to a resonance signal adjusting device, an electromagnetic pen and an electromagnetic handwriting screen system.
Background
With the enhancement of environmental awareness of people, the continuous upgrading of office modes in various industries and the acceleration of modern and informationized construction steps, paperless office is changed from concept to industrialization, and is gradually applied to a plurality of fields. Particularly in the field of electronic devices, more and more electronic devices adopt handwriting screens, such as electronic whiteboards for conference teaching, signature screens, hand-drawn screens, smart phones, tablet computers and the like, and the electronic devices adopting handwriting technology do not use traditional hardware devices (such as keyboards) to input information, but adopt paired electromagnetic pens to input information. Electromagnetic handwriting screen systems typically include a display screen, an electromagnetic antenna module, and an electromagnetic pen for writing or drawing on the electromagnetic handwriting screen. The electromagnetic handwriting screen utilizes an electromagnetic induction technology, and realizes writing or drawing by wireless information interaction between the electromagnetic handwriting pen and an electromagnetic antenna board below the display screen.
The existing handwriting pen has two types, namely a capacitive type and an inductive type, and the capacitive type is applicable to a capacitive screen, and has the defects of no pressure feeling and incapability of suspension operation. The inductive electromagnetic pen is further subdivided into an active inductive pen and a passive inductive pen, and an analog circuit is adopted in the active electromagnetic pen in the market at present, and because component parameters have deviation, and the use environment changes, the component parameters can also change, so that the consistency of resonant frequency of the electromagnetic pen is poor, the emission frequency and the resonant amplitude of the electromagnetic pen are influenced, the electromagnetic pen possibly cannot be matched with an electromagnetic antenna board (electromagnetic handwriting board), and the writing coordinate positioning precision of the electromagnetic pen is low and the pen pressure detection error is large.
Therefore, the traditional technical scheme has the problems that the manual frequency tuning is difficult in the electromagnetic pen production process, the consistency of the resonant frequency is poor, in addition, the resonant frequency deviation is large due to the severe environment (such as high temperature and high humidity) or the environmental factor is changed (for example, from a low temperature environment to a high temperature environment), the positioning accuracy of writing coordinates is poor, the pressure sensing effect is poor, and even the failure is caused.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a resonant signal adjusting device, an electromagnetic pen and an electromagnetic handwriting screen system, which aim to solve the problems that in the traditional technical scheme, manual frequency tuning is difficult, resonant frequency consistency is poor, in addition, severe environments (such as high temperature and high humidity) or environmental factors are changed (for example, from a low temperature environment to a high temperature environment), resonant frequency deviation is large, writing coordinate positioning accuracy is poor, pressure sensing effect is poor and even failure occurs.
A first aspect of an embodiment of the present invention provides a resonance signal adjusting apparatus, including:
and a tuning module for generating a wireless transmit signal based on the frequency adjustment signal.
And the frequency detection module is connected with the tuning module and is used for generating a frequency counting signal according to the resonance signal and the zero clearing signal.
And the control module is connected with the tuning module and the frequency detection module and is used for generating the zero clearing signal and the frequency adjusting signal according to the frequency counting signal so that the frequency of the resonance signal generated by the tuning module according to the frequency adjusting signal is located in a first preset interval.
In one embodiment, the resonant signal conditioning device further comprises:
And the key module is connected with the tuning module and the control module and is used for generating a first key signal and a second key signal according to user input.
The tuning module is further configured to generate a wireless transmission signal with a frequency located in a second preset interval according to the frequency adjustment signal and the first key signal, and generate a wireless transmission signal with a frequency located in a third preset interval according to the frequency adjustment signal and the second key signal.
In one embodiment, the tuning module is further configured to generate a resonant signal having a frequency that is within a fourth preset interval.
The resonance signal adjusting apparatus further includes:
And the first power conversion module is connected with the tuning module and used for generating a resonant power supply according to the power supply enabling signal of the first level and the battery power supply.
The tuning module is specifically configured to generate the wireless transmission signal and the resonance signal according to the resonance power supply and the frequency adjustment signal.
The frequency detection module is also used for generating a pen-in wake-up signal according to the resonance signal.
The control module is further configured to generate a key wake-up signal according to the first key signal or the second key signal, and generate the power enable signal of the first level according to the pen-in wake-up signal or the key wake-up signal.
In one embodiment, the resonant signal conditioning device further comprises:
and the charging protection module is connected with the control module and used for generating a charging detection signal according to the charging power supply.
The control module is further configured to generate the power enable signal of a second level according to the charge detection signal.
The first power conversion module stops generating the resonant power supply according to the power enable signal of the second level.
In one embodiment, the resonant signal conditioning device further comprises:
And the second power conversion module is used for generating a power supply according to the battery power supply to supply power to each functional module.
In one embodiment, the resonant signal conditioning device further comprises:
and the display module is connected with the control module and used for displaying the charging state and the working state according to the charging display signal and the mode display signal.
The control module is also used for generating the charging display signal according to the charging detection signal and generating the mode display signal according to the power supply conversion signal.
In one embodiment, the frequency detection module includes a first comparator, a first resistor, a second resistor, and a first adder counter.
The same-direction input end of the first comparator and the reverse input end of the first comparator jointly form a resonance signal input end of the frequency detection module. The output end of the first comparator is the input wake-up signal output end of the frequency detection module.
The reset end of the first addition counter is a zero clearing signal input end of the frequency detection module.
The output end of the first comparator is connected with the first end of the first resistor and the clock end of the first addition counter, and the second end of the first resistor is connected with a first power supply.
The counting device comprises a first power supply, a first adding counter, a second adding counter, a fifth resistor, a first power supply, a second power supply, a third power supply, a fourth power supply, a fifth resistor, a first enabling end of the first adding counter and a second enabling end of the first adding counter.
In one embodiment, the tuning module includes a first analog switch, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first inductor, and a first triode.
The first end of the second capacitor is connected with a resonant power supply, and the second end of the second capacitor is connected with power ground.
The first end of the seventh resistor, the first end of the first inductor, the first end of the third capacitor, the first common end of the first analog switch and the second common end of the first analog switch are connected with the resonant power supply, the second end of the seventh resistor is connected with the first end of the ninth capacitor, the first end of the eighth resistor and the base of the first triode, the second end of the ninth capacitor, the second end of the eighth resistor, the second end of the tenth capacitor and the second end of the eleventh capacitor are connected with a power supply ground, the emitter of the first triode is connected with the first end of the ninth resistor, the second end of the ninth resistor is connected with the first end of the tenth resistor and the first end of the eleventh capacitor, the second end of the first inductor is connected with the second end of the third capacitor and the base of the first triode, the second end of the fourth capacitor is connected with the second end of the third capacitor and the tenth capacitor, and the collector of the tenth capacitor is connected with the first end of the tenth capacitor.
The first digital control end of the first analog switch and the second digital control end of the first analog switch are jointly configured to be a frequency adjusting signal input end of the tuning module.
The power supply end of the first analog switch is connected with the second power supply, the first normally-closed end of the first analog switch is connected with the first end of the fifth capacitor, the first normally-open end of the first analog switch is connected with the first end of the sixth capacitor, the second normally-open end of the first analog switch is connected with the first end of the seventh capacitor, the second normally-closed end of the first analog switch is connected with the first end of the eighth capacitor, and the second end of the fifth capacitor, the second end of the sixth capacitor, the second end of the seventh capacitor and the second end of the eighth capacitor are connected with the second end of the fourth capacitor.
The second end of the eighth capacitor and the first common end of the first analog switch are jointly configured to be a resonance signal output end of the tuning module.
In one embodiment, the control module includes a microprocessor, a sixth resistor, and a first capacitor.
The microprocessor reset end is connected with the first end of the sixth resistor and the first end of the first capacitor, the second end of the first capacitor is connected with the power ground, and the second end of the sixth resistor is connected with a third power supply.
The analog power end of the microprocessor is connected with the third power supply, the power end of the microprocessor is connected with the third power supply, and the ground end of the microprocessor is connected with the power ground.
The first data input and output end of the microprocessor is a key wake-up signal input end of the control module.
The second data input and output end of the microprocessor is a zero clearing signal output end of the control module.
The third data input and output end of the microprocessor is a first-level power supply enabling signal output end of the control module and a second-level power supply enabling signal output end of the control module. The fourth data input and output end of the microprocessor and the fifth data input and output end of the microprocessor are jointly configured as a frequency adjusting signal output end of the control module.
The sixth data input and output end of the microprocessor is a charging display signal output end of the control module and a mode display signal output end of the control module.
The seventh data input and output end of the microprocessor is the frequency counting signal input end of the control module.
The eighth data input and output end of the microprocessor is a charging detection signal input end of the control module.
And the ninth data input and output end of the microprocessor is a pen-entering wake-up signal input end of the control module.
A second aspect of an embodiment of the present invention provides an electromagnetic pen comprising a resonant signal conditioning device as described above.
A third aspect of an embodiment of the present invention provides an electromagnetic handwriting screen system comprising an electromagnetic handwriting screen having a transmitting coil and a receiving coil, the electromagnetic handwriting screen system further comprising an electromagnetic pen as described above.
According to the embodiment of the invention, the tuning module generates the wireless transmitting signal and the resonance signal according to the frequency adjusting signal, the frequency detecting module generates the frequency counting signal according to the resonance signal and the zero clearing signal, and the control module generates the zero clearing signal and the frequency adjusting signal according to the frequency counting signal, so that the frequency of the resonance signal generated by the tuning module according to the frequency adjusting signal is located in a first preset interval, the automatic adjustment of the resonance frequency can be realized, the transmitting frequency of the active electromagnetic pen is adjusted, the parameter of an element and the parameter of the element are prevented from being changed due to environmental factors, the transmitting frequency of the electromagnetic pen is prevented from being changed, the defects of low coordinate precision of a writing position of the electromagnetic pen and large pen pressure detection error are further caused, the writing pressure sensing precision of the electromagnetic pen is improved, the writing resolution of the electromagnetic pen is improved, the writing coordinate positioning of the electromagnetic pen is accurate, writing has no delay tail, the reduction degree is close to real handwriting, the user experience degree is excellent, and the reliability 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 or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a resonant signal adjusting device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another embodiment of a resonant signal conditioning device according to the present invention;
FIG. 3 is a schematic diagram of another embodiment of a resonant signal conditioning device according to the present invention;
FIG. 4 is a schematic diagram of another embodiment of a resonant signal conditioning device according to the present invention;
FIG. 5 is a schematic diagram of another embodiment of a resonant signal adjusting device according to the present invention;
FIG. 6 is a schematic diagram of another embodiment of a resonant signal conditioning device according to the present invention;
fig. 7 is a schematic circuit diagram of an exemplary resonant signal conditioning device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a schematic structural diagram of a resonant signal adjusting device according to an embodiment of the present invention is shown, for convenience of explanation, only the portions related to the embodiment are shown, and the details are as follows:
A resonance signal adjusting device comprises a tuning module 11, a frequency detection module 12 and a control module 13.
The tuning module 11 is used for generating a radio transmission signal and a resonance signal from the frequency adjustment signal.
The frequency detection module 12 is connected to the tuning module 11 for generating a frequency count signal from the resonance signal and the clear signal.
The control module 13 is connected to the tuning module 11 and the frequency detection module 12, and is configured to generate a clear signal and a frequency adjustment signal according to the frequency count signal, so that the frequency of the resonance signal generated by the tuning module 11 according to the frequency adjustment signal is located in a first preset interval.
In a specific implementation, during the initialization period of the program after the electromagnetic pen is powered on or reset, the control module 13 generates a clear signal and a frequency adjustment signal according to the frequency count signal, so that the frequency of the resonance signal generated by the tuning module 11 according to the frequency adjustment signal is located in a first preset interval. The wireless signal emitted by the resonance module 11 is received by an electromagnetic screen or an electromagnetic handwriting screen with a receiving and transmitting coil, and the electromagnetic screen or the electromagnetic handwriting screen analyzes the resonance frequency and the electromagnetic induction intensity according to the resonance signal, so that the coordinate position is positioned and displayed, and corresponding functional actions are executed. The first preset interval is a certain frequency range taking a preset frequency f0 of an electromagnetic screen or an electromagnetic handwriting screen as a center, and when the frequency of a resonance signal is closer to the preset frequency f0, the writing response sensitivity and the writing pressure sensing precision are higher, and the writing pressure sensing information, namely the Z-axis direction information, is reflected to be the thickness degree of handwriting during writing. The frequency detection module 12 detects the resonant frequency generated by the tuning module 11, generates a frequency counting signal and feeds the frequency counting signal back to the control module 13, so as to realize a self-feedback adjustment function and improve the frequency tuning precision.
According to the embodiment of the invention, the resonant frequency generated by the device is detected, fed back and regulated in real time through the tuning module, the frequency detection module and the control module, the resonant frequency generated by the electromagnetic pen is fed back and regulated before writing in a pen to obtain the preset frequency value close to the electromagnetic screen or the electromagnetic handwriting screen, the emission frequency of the active electromagnetic pen is automatically regulated before writing in the pen, the environmental factors are prevented from influencing the parameters of the components, the emission frequency of the electromagnetic pen is influenced, the resonant frequency consistency is poor, the defects of low coordinate precision of the writing position of the electromagnetic pen and large pen pressure detection error are further caused, the precision of the pressure sensing of the electromagnetic pen and the writing resolution of the electromagnetic pen are improved, the positioning of the writing coordinate of the electromagnetic pen is accurate, the writing has no delay, the handwriting reduction degree is close to the real handwriting, the user experience degree is excellent, and the reliability is improved.
Referring to fig. 2, in one embodiment, the resonant signal adjusting device further includes a key module 14.
The key module 14 is connected to the tuning module 11 and the control module 13, and is configured to generate a first key signal and a second key signal according to a user input.
The tuning module 11 is further configured to generate a wireless transmission signal with a frequency located in a second preset interval according to the frequency adjustment signal and the first key signal, and generate a wireless transmission signal with a frequency located in a third preset interval according to the frequency adjustment signal and the second key signal.
In specific implementation, the frequency of the wireless transmitting signal in the second preset interval, the frequency of the wireless transmitting signal in the third preset interval and the frequency of the resonant signal in the first preset interval are respectively different from each other in the preset frequency intervals corresponding to the three signals, that is, the frequency of the wireless transmitting signal generated by the key module 14 and the frequency of the resonant signal generated during writing are not in one interval, so that the electromagnetic screen or the electromagnetic handwriting screen can receive and process the two wireless transmitting signals and the resonant signal without mutual influence, misjudgment is avoided, and the writing and control precision and reliability are improved. Optionally, the electromagnetic screen or the electromagnetic handwriting screen performs corresponding function operations according to the wireless transmission signal, for example, a cursor control operation function similar to a mouse.
According to the embodiment of the invention, the wireless control function is realized by combining the key module with the tuning module, so that the function of the electromagnetic pen is enriched.
Referring to fig. 3, in one embodiment, the tuning module 11 is further configured to generate a resonant signal with a frequency within a fourth preset interval according to the pressure sensing signal.
The resonant signal conditioning device further comprises a first power conversion module 101.
The first power conversion module 101 is connected to the tuning module 11 for generating a resonant power supply based on the power enable signal of the first level and the battery power supply.
The tuning module 11 is specifically configured to generate a wireless transmit signal and a resonant signal based on the resonant power supply and the frequency adjustment signal.
The frequency detection module 12 is further configured to generate a pen-in wake-up signal according to the resonance signal.
The control module 13 is further configured to generate a key wake-up signal according to the first key signal or the second key signal, and generate a power enable signal of a first level according to the incoming wake-up signal or the key wake-up signal.
In specific implementation, when the resonant signal adjusting device enters the antenna radiation range of the electromagnetic screen or the electromagnetic handwriting screen from the deep sleep state, that is, the electromagnetic pen enters the magnetic field area of the electromagnetic screen or the electromagnetic handwriting screen, a resonant signal with the frequency being in a fourth preset interval is generated by the tuning module 11 according to the electromagnetic induction characteristic; the frequency detection module 12 generates a pen-in wake-up signal according to the resonance signal with the frequency in a fourth preset interval and sends the wake-up signal to the control module 13; the control module 13 generates a key wake-up signal according to the first key signal or the second key signal, and generates a first-level power enable signal according to the pen-in wake-up signal or the key wake-up signal, wherein the selectable first-level power enable signal is a high-level power enable signal; the first power conversion module 101 generates a resonance power source according to the high-level power enable signal and the battery power source to supply power to the tuning module 11, so that the tuning module 11 enters an operating state, and generates a wireless transmission signal and a resonance signal according to the resonance power source and the frequency adjustment signal.
According to the embodiment of the invention, the control module is awakened only when the antenna radiation range of the electromagnetic screen or the electromagnetic handwriting screen is entered through the pen-in awakening or key awakening signal, so that the first power supply conversion module is controlled to convert the battery power supply into the resonance power supply to supply power to the tuning module to enter the working state, and therefore, a large amount of energy loss caused by the fact that the tuning module is always in the working state is avoided.
Referring to fig. 4, in one embodiment, the resonant signal conditioning device further includes a charge protection module 100.
The charge protection module 100 is connected to the control module 13, and is configured to generate a charge detection signal according to a charging power source.
The control module 13 is further configured to generate a second level power enable signal according to the charge detection signal.
The first power conversion module 101 stops generating the resonant power according to the power enable signal of the second level.
In a specific implementation, optionally, the second level power enable signal is a low level power enable signal. When the charging protection module 100 detects that the battery is being charged to generate a charging detection signal, the control module 13 controls the first power conversion module 101 to stop according to the charging detection signal, converts the battery power into a resonant power to supply power to the tuning module 11, that is, turns off the power of the tuning module 11 when resonance is not needed, so that the influence of unstable resonant power on components of the tuning module 11 caused by unstable battery voltage during charging is avoided, the protection of the tuning module 11 during charging is realized, and the safety and reliability of the device during charging are improved.
Referring to fig. 5, in one embodiment, the resonant signal conditioning device further includes a second power conversion module 102.
The second power conversion module 102 is configured to generate a power supply according to the battery power to supply power to each functional module.
The power supply is separately arranged for the tuning module and other functional modules, the tuning module is electrified only when resonance work is needed, and different power supply modules are arranged according to different power consumption requirements of the non-functional modules, so that the minimum system work and standby power consumption is ensured.
Referring to fig. 6, in one embodiment, the resonant signal adjusting device further includes a display module 15.
The display module 15 is connected with the control module 13, and is used for displaying the charging state and the working state according to the charging display signal and the mode display signal. In a specific implementation, in addition to the charge indication and the working state indication through the display module 15, an alarm indication can be performed on the low-battery state.
According to the embodiment of the invention, the charging state is displayed through the display module, and different working states are displayed, so that a user can intuitively know the states of the device and the electromagnetic pen, and timely remind the user of charging the electromagnetic pen.
Referring to fig. 7, in one embodiment, the frequency detection module 12 includes a first comparator U9-a, a first resistor R1, a second resistor R2, and a first adder-counter U2.
The same-directional input of the first comparator U9-a and the opposite-directional input of the first comparator U9-a together form a resonant signal input of the frequency detection module 12. The output end of the first comparator U9-A is the input wake-up signal output end of the frequency detection module 12.
The reset terminal RST of the first adder U2 is a clear signal input terminal of the frequency detection module 12.
The output end of the first comparator U9-A is connected with the first end of the first resistor R1 and the clock end CLK of the first addition counter U2, and the second end of the first resistor R1 is connected with a first power supply.
The counting end LD of the first adding counter U2, the first enabling end P of the first adding counter U2 and the second enabling end T of the first adding counter U2 are connected with a first power supply, the fourth output end Q3 of the first adding counter U2 is connected with the first end of the second resistor R2, and the second end of the second resistor R2 is a frequency counting signal output end of the frequency detecting module 12.
In a specific implementation, optionally, the first power supply is a 3V power supply. The first output terminal Q0 of the first adder-counter U2, the second output terminal Q1 of the first adder-counter U2, and the third output terminal Q2 of the first adder-counter U2 may be left empty, or may be connected in series with the third resistor R3, the fourth resistor R4, and the fifth resistor R5, respectively, and then connected to the power ground GND.
Referring to fig. 7, in one embodiment, the tuning module 11 includes a first analog switch U1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first inductor L1, and a first triode Q1.
The first end of the second capacitor C2 is connected to the resonant power supply, and the second end of the second capacitor C2 is connected to the power supply ground GND.
The first end of the seventh resistor R7, the first end of the first inductor L1, the first end of the third capacitor C3, the first common end COM1 of the first analog switch U1 and the second common end COM2 of the first analog switch U1 are connected to the resonant power supply, the second end of the seventh resistor R7 is connected to the first end of the ninth capacitor C9 and the first end of the eighth resistor R8 and the base of the first transistor Q1, the second end of the ninth capacitor C9 and the second end of the eighth resistor R8, the second end of the tenth resistor R10 and the second end of the eleventh capacitor C11 are connected to the power supply ground GND, the emitter of the first transistor Q1 is connected to the first end of the ninth resistor R9, the second end of the ninth resistor R9 is connected to the first end of the tenth resistor R10 and the first end of the eleventh capacitor C11, the second end of the first inductor L1 is connected to the second end of the third capacitor C3 and the collector of the first transistor Q1, the second end of the fourth capacitor C4 is connected to the second end of the tenth capacitor C3 and the tenth capacitor C11.
The first digital control terminal IN1 of the first analog switch U1 and the second digital control terminal IN2 of the first analog switch U1 together form a frequency adjustment signal input of the tuning module 11.
The power end of the first analog switch U1 is connected with the second power supply, the first normally-closed end NC1 of the first analog switch U1 is connected with the first end of the fifth capacitor C5, the first normally-open end NO1 of the first analog switch U1 is connected with the first end of the sixth capacitor C6, the second normally-open end NO2 of the first analog switch U1 is connected with the first end of the seventh capacitor C7, the second normally-closed end NC2 of the first analog switch U1 is connected with the first end of the eighth capacitor C8, the second end of the fifth capacitor C5, the second end of the sixth capacitor C6, the second end of the seventh capacitor C7 and the second end of the eighth capacitor C8 are connected with the second end of the fourth capacitor C4.
The second terminal of the eighth capacitor C8 and the first common terminal COM1 of the first analog switch U1 and the second common terminal COM2 of the first analog switch together form a resonance signal output terminal of the tuning module 11.
In a specific implementation, the resonant power supply is optionally a 5V power supply, and the second power supply is a 3V power supply.
Referring to fig. 7, in one embodiment, the control module 13 includes a microprocessor U3, a sixth resistor R6, and a first capacitor C1.
The reset terminal NRST of the microprocessor U3 is connected to the first terminal of the sixth resistor R6 and the first terminal of the first capacitor C1, the second terminal of the first capacitor C1 is connected to the power ground GND, and the second terminal of the sixth resistor R6 is connected to the third power supply.
The analog power supply terminal VDDA of the microprocessor U3 is connected to the third power supply, the power supply terminal VDD of the microprocessor U3 is connected to the third power supply, and the ground terminal VSS of the microprocessor U3 is connected to the power supply ground GND.
The first data input/output PA7 of the microprocessor U3 is a key wake-up signal input of the control module 13.
The second data input/output PA10 of the microprocessor U3 is a clear signal output of the control module 13.
The third data input/output PA6 of the microprocessor U3 is a first level power enable signal output of the control module 13 and a second level power enable signal output of the control module 13.
The fourth data input/output PA13 of the microprocessor U3 and the fifth data input/output PA14 of the microprocessor U3 together form a frequency control signal output of the control module 13.
The sixth data input/output PA4 of the microprocessor U3 is a charge display signal output of the control module 13 and a mode display signal output of the control module 13.
The seventh data input/output PA9 of the microprocessor U3 is the frequency count signal input of the control module 13.
The eighth data input/output PA2 of the microprocessor U3 is a charge detection signal input of the control module 13.
The ninth data input/output PA15 of the microprocessor U3 is an incoming wake-up signal input of the control module 13.
In a specific implementation, optionally, the third power supply is 3V, and the display module 15 includes a light emitting diode, and displays the charging state and the operating mode state through the light emitting diode. The second power conversion module 102 includes an LDO (low dropout regulator, low dropout linear regulator) chip, and the first power conversion module 101 includes a synchronous rectification chip, so that quiescent current reaches up to uA level, and resonant operating voltage conversion efficiency is above 93%.
The working principle of a resonant signal conditioning device will be further described with reference to fig. 7:
The first inductor L1 is connected in parallel with the third capacitor C3 and the fourth capacitor C4, connected in parallel with the fourth capacitor C5, the fourth capacitor C6, the fourth capacitor C7 and the fourth capacitor C8 controlled by the first analog switch U1, and connected in parallel with the twelfth capacitor C12 and the thirteenth capacitor C13 controlled by the first key switch SW1 and the second key switch SW2, so as to form an LC parallel resonant circuit. The oscillation frequency of the LC parallel resonant circuit is Wherein L is the inductance of the first inductor, and C is the capacitance of the capacitor connected in parallel with the first inductor L1.
When the device is detected to enter the antenna radiation range of the electromagnetic screen or the electromagnetic handwriting screen, a resonant signal with the frequency in a fourth preset interval is generated through the LC parallel resonant circuit, the resonant signal with the frequency in the fourth preset interval generates a pen-in wake-up signal (WKUP 1) after passing through the first comparator U9-A and is transmitted to the microprocessor U3 through the ninth data input and output end PA15 of the microprocessor U3, the microprocessor U3 generates a high-level power supply enable signal (DCDC_EN) according to the pen-in wake-up signal (WKUP 1), and the DC-DC conversion chip U4 of the first power supply conversion module 101 is controlled to convert the battery power supply VBAT into a resonant power supply (5V) to supply power to the LC parallel resonant circuit and the first analog switch U1 to enter a resonance and tuning working state.
When the electromagnetic pen is used for writing, the pen point is pressed to generate displacement, the magnetic core is connected with the pen point, so that the magnetic core is displaced relative to the coil, the inductance of the first inductor L1 is changed, the resonant frequency is changed according to a calculation formula of the resonant frequency f, the changed frequency information is Z-axis pressure sensing information, at the moment, a resonant signal generated by the tuning module 11 is transmitted out through the first inductor L1, meanwhile, frequency detection and counting are carried out through the first comparator U9-A and the first addition counter U2 to generate a frequency counting signal, and the frequency counting signal is transmitted to the microprocessor U3 through a seventh data input and output end PA9 of the microprocessor U3; the microprocessor U3 generates a first frequency adjusting signal and a second frequency adjusting signal according to the frequency calculating signal, outputs the first frequency adjusting signal and the second frequency adjusting signal through a fourth data input output end PA13 of the microprocessor U3 and a fifth data input output end PA14 of the microprocessor U3, and transmits the first frequency adjusting signal and the second frequency adjusting signal to the first analog switch U1 through a first digital control end IN1 of the first analog switch U1 and a second digital control end IN2 of the first analog switch U1; the first analog switch U1 is used for selecting and communicating a capacitor connected with the first inductor L1 in parallel according to the first frequency adjusting signal and the second frequency adjusting signal, so that the resonant frequency of the LC parallel resonant circuit is adjusted in real time, the resonant frequency of the LC parallel resonant circuit is automatically adjusted to be in a stable range close to the preset frequency of an electromagnetic screen or an electromagnetic handwriting screen, the automatic adjustment of the resonant frequency is realized, the emitting frequency of an active electromagnetic pen is adjusted, the defects that element parameter deviation and environmental factors influence the emitting frequency of the electromagnetic pen, and therefore the coordinate precision of a writing position of the electromagnetic pen is low and the pen pressure detection error is large are avoided, the pressure sensing precision of the electromagnetic pen and the writing resolution of the electromagnetic pen are improved, the writing coordinate positioning of the electromagnetic pen is accurate, the writing has no delay trailing, the handwriting degree is close to the actual handwriting, and the writing reliability of the electromagnetic pen is improved. Meanwhile, the problems that the manual frequency tuning is difficult and the consistency of the resonant frequency is poor in the electromagnetic pen production process are solved.
When the device is detected to enter the antenna radiation range of the electromagnetic screen or the electromagnetic handwriting screen and exceeds the preset time, for example, the preset time is 30 minutes, and the LC parallel resonant circuit does not generate a resonant signal with the frequency within the first preset range, the microprocessor U3 generates a low-level power supply enabling signal (DCDC_EN), and the power supply (namely the resonant power supply) of the LC parallel resonant circuit is disconnected to save energy consumption.
Pressing a first key switch SW1, merging an LC parallel resonant circuit into a twelfth capacitor C12, pressing a second key switch SW2, merging the LC parallel resonant circuit into a thirteenth capacitor C13, respectively generating a wireless transmission signal with the frequency in a second preset interval and a wireless transmission signal with the frequency in a third preset interval, simultaneously generating a key wake-up signal (WKUP 3), wirelessly transmitting the wireless transmission signal with the frequency in the second preset interval and the wireless transmission signal with the frequency in the third preset interval to an electromagnetic screen or an electromagnetic handwriting screen through a first inductor L1, receiving and analyzing the wireless transmission signals by the electromagnetic screen or the electromagnetic handwriting screen, and realizing related functional operation through the first key switch SW1 and the second key switch SW 2; the microprocessor U3 receives the key wake-up signal (WKUP 3) through the first data input/output terminal PA7 thereof and generates a high-level power enable signal (dcdc_en) according to the key wake-up signal (WKUP 3), and controls the dc-dc conversion chip U4 of the first power conversion module 101 to convert the battery power (VBAT) into a resonant power to supply power to the LC parallel resonant circuit and the first analog switch U1 to enter the resonant and tuning working state.
A second aspect of an embodiment of the present invention provides an electromagnetic pen comprising a resonant signal conditioning device as described above.
According to the electromagnetic pen, the resonant frequency can be adjusted in a self-feedback mode, so that the tuning module generates a resonant signal with the frequency in the first preset interval, the resonant frequency is automatically adjusted, the emitting frequency of the active electromagnetic pen is adjusted, the defects that the coordinate precision of the writing position of the electromagnetic pen is low and the pen pressure detection error is large due to the fact that element parameters and environmental factors influence the emitting frequency of the electromagnetic pen are avoided, the pressure sensing precision of the electromagnetic pen and the writing resolution of the electromagnetic pen are improved, the writing coordinate positioning of the electromagnetic pen is accurate, writing has no delay trailing, the handwriting reduction degree is close to that of real handwriting, the user experience degree is excellent, and the writing reliability of the electromagnetic pen is improved. Meanwhile, the problems that the manual frequency tuning is difficult and the consistency of the resonant frequency is poor in the electromagnetic pen production process are solved.
A third aspect of an embodiment of the present invention provides an electromagnetic handwriting screen system comprising an electromagnetic handwriting screen having a transmitting coil and a receiving coil, the electromagnetic handwriting screen system further comprising an electromagnetic pen as described above.
Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments. In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. A resonance signal conditioning apparatus, characterized in that the resonance signal conditioning apparatus comprises:
A tuning module for generating a wireless transmit signal and a resonant signal from the frequency adjustment signal;
The frequency detection module is connected with the tuning module and used for generating a frequency counting signal according to the resonance signal and the zero clearing signal;
The control module is connected with the tuning module and the frequency detection module and is used for generating the zero clearing signal and the frequency adjusting signal according to the frequency counting signal so that the frequency of the resonance signal generated by the tuning module according to the frequency adjusting signal is located in a first preset interval;
the frequency detection module comprises a first comparator, a first resistor, a second resistor and a first addition counter;
The same-direction input end of the first comparator and the reverse input end of the first comparator jointly form a resonance signal input end of the frequency detection module; the output end of the first comparator is the pen-in wake-up signal output end of the frequency detection module;
the reset end of the first addition counter is a zero clearing signal input end of the frequency detection module;
The output end of the first comparator is connected with the first end of the first resistor and the clock end of the first addition counter, and the second end of the first resistor is connected with a first power supply;
The counting end of the first addition counter, the first enabling end of the first addition counter and the second enabling end of the first addition counter are connected with the first power supply, the fourth output end of the first addition counter is connected with the first end of the second resistor, and the second end of the second resistor is a frequency counting signal output end of the frequency detection module;
the tuning module comprises a first analog switch, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first inductor and a first triode;
The first end of the second capacitor is connected with a resonant power supply, and the second end of the second capacitor is connected with power supply ground;
The first end of the seventh resistor, the first end of the first inductor, the first end of the third capacitor, the first common end of the first analog switch and the second common end of the first analog switch are connected with the resonant power supply, the second end of the seventh resistor is connected with the first end of the ninth capacitor and the first end of the eighth resistor and the base of the first triode, the second end of the ninth capacitor and the second end of the eighth resistor, the second end of the tenth resistor and the second end of the eleventh capacitor are connected with a power supply ground, the emitter of the first triode is connected with the first end of the ninth resistor, the second end of the ninth resistor is connected with the first end of the tenth resistor and the first end of the eleventh capacitor, the second end of the first inductor is connected with the second end of the third capacitor and the base of the first triode, the second end of the fourth capacitor is connected with the second end of the third capacitor and the tenth capacitor and the fourth end of the tenth capacitor is connected with the collector of the tenth capacitor;
the first digital control end of the first analog switch and the second digital control end of the first analog switch are jointly configured to be a frequency adjusting signal input end of the tuning module;
The power supply end of the first analog switch is connected with a second power supply, the first normally-closed end of the first analog switch is connected with the first end of the fifth capacitor, the first normally-open end of the first analog switch is connected with the first end of the sixth capacitor, the second normally-open end of the first analog switch is connected with the first end of the seventh capacitor, the second normally-closed end of the first analog switch is connected with the first end of the eighth capacitor, and the second end of the fifth capacitor, the second end of the sixth capacitor, the second end of the seventh capacitor and the second end of the eighth capacitor are connected with the second end of the fourth capacitor;
The second end of the eighth capacitor and the first common end of the first analog switch are jointly configured to be a resonance signal output end of the tuning module.
2. The resonant signal conditioning device of claim 1, wherein the resonant signal conditioning device further comprises:
the key module is connected with the tuning module and the control module and is used for generating a first key signal and a second key signal according to user input;
The tuning module is further configured to generate a wireless transmission signal with a frequency located in a second preset interval according to the frequency adjustment signal and the first key signal, and generate a wireless transmission signal with a frequency located in a third preset interval according to the frequency adjustment signal and the second key signal.
3. The resonant signal conditioning device of claim 2, wherein the tuning module is further configured to generate a resonant signal having a frequency within a fourth predetermined interval;
The resonance signal adjusting apparatus further includes:
The first power conversion module is connected with the tuning module and used for generating a resonant power supply according to the power supply enabling signal of the first level and the battery power supply;
The tuning module is specifically configured to generate the wireless transmission signal and the resonance signal according to the resonance power supply and the frequency adjustment signal; the frequency detection module is also used for generating a pen-in wake-up signal according to the resonance signal;
the control module is further configured to generate a key wake-up signal according to the first key signal or the second key signal, and generate the power enable signal of the first level according to the pen-in wake-up signal or the key wake-up signal.
4. A resonant signal conditioning device as recited in claim 3, wherein the resonant signal conditioning device further comprises:
the charging protection module is connected with the control module and used for generating a charging detection signal according to a charging power supply;
the control module is further used for generating a power supply enabling signal of a second level according to the charging detection signal;
The first power conversion module stops generating the resonant power supply according to the power enable signal of the second level.
5. A resonant signal conditioning device as recited in claim 3, wherein the resonant signal conditioning device further comprises:
And the second power conversion module is used for generating a power supply according to the battery power supply to supply power to each functional module.
6. The resonant signal conditioning device of claim 1, wherein the control module comprises a microprocessor, a sixth resistor, and a first capacitor;
the microprocessor reset end is connected with the first end of the sixth resistor and the first end of the first capacitor, the second end of the first capacitor is connected with the power ground, and the second end of the sixth resistor is connected with a third power supply;
The analog power end of the microprocessor is connected with the third power supply, the power end of the microprocessor is connected with the third power supply, and the ground end of the microprocessor is connected with the power supply ground;
The first data input and output end of the microprocessor is a key wake-up signal input end of the control module;
The second data input and output end of the microprocessor is a zero clearing signal output end of the control module;
The third data input and output end of the microprocessor is a first-level power supply enabling signal output end of the control module and a second-level power supply enabling signal output end of the control module; the fourth data input and output end of the microprocessor and the fifth data input and output end of the microprocessor are jointly formed into a frequency adjusting signal output end of the control module;
The sixth data input and output end of the microprocessor is a charging display signal output end of the control module and a mode display signal output end of the control module;
the seventh data input and output end of the microprocessor is a frequency counting signal input end of the control module;
the eighth data input and output end of the microprocessor is a charging detection signal input end of the control module;
and the ninth data input and output end of the microprocessor is a pen-entering wake-up signal input end of the control module.
7. An electromagnetic pen, characterized in that it comprises a resonant signal conditioning device according to any one of claims 1 to 6.
8. An electromagnetic handwriting screen system comprising an electromagnetic handwriting screen having a transmitting coil and a receiving coil, wherein the electromagnetic handwriting screen system further comprises an electromagnetic pen according to claim 7.
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| CN105453002A (en) * | 2013-07-31 | 2016-03-30 | 苹果公司 | Touch controller architecture |
| CN106843544A (en) * | 2017-01-22 | 2017-06-13 | 深圳市绘王动漫科技有限公司 | The pressure sensitivity signal processing system of source-free hand-writing pen, method and hand drawing board |
| CN209962227U (en) * | 2019-06-06 | 2020-01-17 | 深圳市优笔触控科技有限公司 | Resonance signal adjusting device, electromagnetic pen and electromagnetic handwriting screen system |
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| US11099687B2 (en) * | 2017-09-20 | 2021-08-24 | Synaptics Incorporated | Temperature compensation and noise avoidance for resonator pen |
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| CN105453002A (en) * | 2013-07-31 | 2016-03-30 | 苹果公司 | Touch controller architecture |
| CN106843544A (en) * | 2017-01-22 | 2017-06-13 | 深圳市绘王动漫科技有限公司 | The pressure sensitivity signal processing system of source-free hand-writing pen, method and hand drawing board |
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