CN209962227U - 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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- CN209962227U CN209962227U CN201920856455.1U CN201920856455U CN209962227U CN 209962227 U CN209962227 U CN 209962227U CN 201920856455 U CN201920856455 U CN 201920856455U CN 209962227 U CN209962227 U CN 209962227U
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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 tuning module generates a wireless transmitting signal and a resonant signal according to the frequency adjusting signal, the frequency detection module generates a frequency counting signal according to the resonant signal and the zero clearing signal, the control module generates a zero clearing signal and a frequency adjusting signal according to the frequency counting signal, the frequency of the resonant parameter generated by the tuning module to generate the resonant signal is located in a first preset interval, automatic adjustment of the resonant frequency is achieved, the transmitting frequency of the active electromagnetic pen is adjusted, the resonant transmitting frequency of the electromagnetic pen is prevented from being influenced by element parameter deviation and using environment factors, the defects that the writing position coordinate precision of the electromagnetic pen is low and the pen pressure detection error is large are overcome, the writing pressure sensitivity precision and the writing resolution of the electromagnetic pen are improved, the writing coordinate positioning is accurate, no delay trailing is written, the reduced handwriting degree is close to the real handwriting, and the user experience degree is excellent.
Description
Technical Field
The utility model belongs to the technical field of electronic information input equipment, especially, relate to a resonance signal adjusting device, electromagnetism pen and electromagnetism handwriting screen system.
Background
With the enhancement of environmental awareness of people, various industries continuously upgrade the office mode, and the pace of modernization and informatization construction is accelerated, and paperless office is gradually applied to many fields from concept to industrialization. Especially in the field of electronic devices, more and more electronic devices employ handwriting screens, such as electronic whiteboards for meeting teaching, signature screens, handwriting screens, smartphones, tablet computers, and the like, and these electronic devices employing handwriting technology no longer use traditional hardware devices (such as keyboards) to input information, but use matched electromagnetic pens to input information. An electromagnetic handwriting screen system generally includes a display screen, an electromagnetic antenna module, and an electromagnetic pen for writing or drawing on the electromagnetic handwriting screen. The electromagnetic handwriting screen realizes writing or drawing by utilizing an electromagnetic induction technology and wirelessly exchanging information through an electromagnetic antenna board below the electromagnetic handwriting pen and the display screen.
The existing handwriting pen has two types, namely a capacitance type and an inductance type, wherein the capacitance type is suitable for a capacitance screen and has the defects of no inductance and incapability of suspension operation. Inductance type electromagnetic pen, the active inductance pen and passive inductance pen of subdividing again, active electromagnetic pen on the existing market adopts analog circuit more, because there is the deviation in component parameter itself, and the service environment changes the parameter variation that also can lead to components and parts, thereby it is poor to lead to the resonant frequency uniformity of electromagnetic pen, influence the transmitting frequency and the resonance amplitude of electromagnetic pen, the event probably leads to the electromagnetic pen can't match electromagnetic antenna board (electromagnetism handwriting pad), lead to the low and stroke detection error of writing coordinate positioning accuracy of electromagnetic pen big.
Therefore, the traditional technical scheme has the problems that the frequency is difficult to tune manually in the production process of the electromagnetic pen, the consistency of the resonant frequency is poor, in addition, the deviation of the resonant frequency is large in severe environment (such as high temperature and high humidity) or environmental factor change (such as from low-temperature environment to high-temperature environment), the positioning accuracy of writing coordinates is poor, the pressure effect is poor, and even the failure is caused.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a resonance signal adjusting device, electromagnetic pen and electromagnetism handwriting screen system aims at solving and has the manual tuning frequency difficulty in the electromagnetic pen production process among the traditional technical scheme, and resonant frequency uniformity is poor, and adverse circumstances (such as high temperature and high humidity) or environmental factor change (for example from low temperature environment to high temperature environment) also can lead to resonant frequency deviation big in addition, and it is poor to write coordinate positioning accuracy, and the pressure is felt the effect not good, the problem that became invalid even.
The utility model discloses a first aspect of the embodiment provides a resonance signal adjusting device, resonance signal adjusting device includes:
and the tuning module is used for generating a wireless transmission signal according to the frequency adjusting signal.
And 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.
And the control module is connected with the tuning module and the frequency detection module and used for generating the zero clearing signal and the frequency adjusting signal according to the frequency counting signal so as to enable the frequency of the resonance signal generated by the tuning module according to the frequency adjusting signal to be positioned in a first preset interval.
In one embodiment, the resonance signal adjusting apparatus further comprises:
and the key module is connected with the tuning module and the control module and 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 transmitting signal with a frequency in a second preset interval according to the frequency adjusting signal and the first key signal, and generate a wireless transmitting signal with a frequency in a third preset interval according to the frequency adjusting signal and the second key signal.
In one embodiment, the tuning module is further configured to generate a resonance signal having a frequency within a fourth preset interval.
The resonance signal adjusting apparatus further includes:
and the first power supply 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 transmit signal and the resonant signal according to the resonant power supply and the frequency adjustment signal.
The frequency detection module is further used for generating a pen-in wake-up signal according to the resonance signal.
The control module is further configured to generate a key wakeup signal according to the first key signal or the second key signal, and generate a power enable signal of the first level according to the pen entry wakeup signal or the key wakeup signal.
In one embodiment, the resonance signal adjusting apparatus 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 at a second level according to the charge detection signal.
And the first power supply conversion module stops generating the resonant power supply according to the power supply enabling signal of the second level.
In one embodiment, the resonance signal adjusting apparatus further comprises:
and the second power supply 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 resonance signal adjusting apparatus 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 further configured to generate the charging display signal according to the charging detection signal, and generate the mode display signal according to the power conversion signal.
In one embodiment, the frequency detection module includes a first comparator, a first resistor, a second resistor, and a first summing counter.
The same-direction input end of the first comparator and the reverse-direction input end of the first comparator are jointly formed as the resonant 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.
And the reset end of the first addition counter is the 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 number setting 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 fifth resistor, and the second end of the second resistor is the frequency counting signal output end of the frequency detection module.
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 transistor.
And the first end of the second capacitor is connected with the resonant power supply, and the second end of the second capacitor is connected with the power ground.
A first end of the seventh resistor, a first end of the first inductor, a first end of the third capacitor, a first common end of the first analog switch, and a second common end of the first analog switch are connected to the resonant power supply, a second end of the seventh resistor is connected to a first end of the ninth capacitor, a first end of the eighth resistor, and a base of the first transistor, a second end of the ninth capacitor, a second end of the eighth resistor, a second end of the tenth resistor, and a second end of the eleventh capacitor are connected to a power ground, an emitter of the first transistor is connected to a first end of the ninth resistor, a second end of the ninth resistor is connected to a first end of the tenth resistor and a first end of the eleventh capacitor, a second end of the first inductor is connected to a second end of the third capacitor and a collector of the first transistor, the second terminal of the fourth capacitor is connected to the second terminal of the third capacitor and the first terminal of the tenth capacitor, and the second terminal of the tenth capacitor is connected to the first terminal of the eleventh capacitor.
The first digital control end of the first analog switch and the second digital control end of the first analog switch are jointly formed as 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, the first common end of the first analog switch and the second common end of the first analog switch are jointly formed as a resonant signal output end of the tuning module.
In one embodiment, 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 a power ground, and the second end of the sixth resistor is connected with a third power supply.
The analog power supply end of the microprocessor is connected with the third power supply, the power supply end of the microprocessor is connected with the third power supply, and the ground end of the microprocessor is connected with a power ground.
And the first data input and output end of the microprocessor is a key wake-up signal input end of the control module.
And a second data input and output end of the microprocessor is a zero clearing signal output end of the control module.
And the third data input and output end of the microprocessor is a power supply enabling signal output end of the first level of the control module and a power supply enabling signal output end of the second level of the control module. And 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.
And a 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.
And a seventh data input and output end of the microprocessor is a frequency counting signal input end of the control module.
And an eighth data input/output end of the microprocessor is a charging detection signal input end of the control module.
And a ninth data input/output end of the microprocessor is an input end of the pen-in wake-up signal of the control module.
A second aspect of the embodiments of the present invention provides an electromagnetic pen, which includes a resonance signal adjusting device as described above.
The utility model discloses the third aspect of embodiment provides an electromagnetism handwriting screen system, including the electromagnetism handwriting screen that has sending coil and receiving coil, electromagnetism handwriting screen system still includes as above-mentioned the electromagnetism pen.
The embodiment of the utility model provides a through the tuning module according to frequency adjustment signal generation wireless transmitting signal and resonance signal, frequency detection module generates the frequency count signal according to resonance signal and zero clearing signal, control module generates zero clearing signal and frequency adjustment signal according to the frequency count signal, so that the frequency of the resonance signal that tuning module generated according to the frequency adjustment signal is located first preset interval, can realize resonant frequency's automatically regulated, the transmitting frequency of active electromagnetic pen has been adjusted, avoid environmental factor can lead to the parameter of components and parts to change, thereby lead to the transmitting frequency of electromagnetic pen to change, and then lead to the writing position coordinate precision of electromagnetic pen low and the big defect of stroke detection error, improve the electromagnetic pen and write pressure sense precision, improve the resolution ratio that the electromagnetic pen writes, the electromagnetic pen writes coordinate location accuracy, write and not write the delay tailing, the handwriting reduction degree is close to the 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 required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a resonance signal adjusting apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a resonance signal adjusting apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a resonance signal adjusting apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a resonance signal adjusting apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a resonance signal adjusting apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a resonance signal adjusting apparatus according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram illustrating an exemplary resonant signal conditioning device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a schematic structural diagram of a resonance signal adjusting apparatus according to an embodiment of the present invention shows only the relevant parts of the embodiment for convenience of description, 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 configured to generate a wireless transmission signal and a resonant signal according to the frequency adjustment signal.
The frequency detection module 12 is connected to the tuning module 11 and configured to generate a frequency count signal according to 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 configured to generate a zero clearing 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 program initialization period 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 transmitted by the resonance module 11 is received by an electromagnetic screen or an electromagnetic handwriting screen with a transceiver coil, and the electromagnetic screen or the electromagnetic handwriting screen resolves the resonance frequency and the electromagnetic induction intensity according to the resonance signal, so as to realize the coordinate position positioning and display and execute the corresponding functional action. The first preset interval is a certain frequency range with the preset frequency f0 of the electromagnetic screen or the electromagnetic handwriting screen as the center, and when the frequency of the resonance signal is closer to the preset frequency f0, the pen writing response sensitivity and the pen pressure sensing precision are higher, and the pen pressure sensing information, namely the Z-axis direction information, is reflected as the thickness degree of handwriting during writing. The frequency detection module 12 detects the resonant frequency generated by the tuning module 11 and generates a frequency counting signal to be fed back to the control module 13, so that a self-feedback adjustment effect is realized, and the frequency tuning precision is improved.
The embodiment of the utility model provides a through the tuning module, frequency detection module and control module form the return circuit that resonance frequency that the device produced carries out real-time detection, feedback and regulation, realize that the resonance frequency that produces the electromagnetic pen carries out self-feedback and regulation before writing into writing to obtain the preset frequency value that is close electromagnetic screen or electromagnetic handwriting screen, through the automatic adjustment before writing into writing active electromagnetic pen's transmitting frequency, avoided the environmental factor can influence the parameter of components and parts, thereby lead to influencing the transmitting frequency of electromagnetic pen, make resonant frequency uniformity poor, and then lead to the writing position coordinate precision of electromagnetic pen low and the big defect of pen pressure detection error, electromagnetic pen pressure sensitivity precision and the resolution ratio of electromagnetic pen writing have been improved, electromagnetic pen writes coordinate positioning accuracy, write and have not had delay and has trailed, handwriting reduction degree is close true handwriting, user experience degree is splendid, the reliability is improved.
Referring to fig. 2, in one embodiment, the resonance signal adjusting apparatus 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 transmitting signal with a frequency in a second preset interval according to the frequency adjusting signal and the first key signal, and generate a wireless transmitting signal with a frequency in a third preset interval according to the frequency adjusting signal and the second key signal.
In the specific implementation, the wireless transmission signal with the frequency in the second preset interval, the wireless transmission signal with the frequency in the third preset interval and the resonant signal with the frequency in the first preset interval are different from each other, that is, the frequency of the wireless transmission 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 two wireless transmission signals and the resonant signal received and processed by the electromagnetic screen or the electromagnetic handwriting screen cannot influence each other, no misjudgment exists, and the precision and the reliability of writing and control are improved. Optionally, the electromagnetic screen or the electromagnetic handwriting screen performs corresponding function operation according to the wireless transmission signal, for example, a cursor control operation function similar to a mouse.
The embodiment of the utility model provides a combine tuning module to realize wireless control function through the button module, richened the function effect of electromagnetism pen.
Referring to fig. 3, in one embodiment, the tuning module 11 is further configured to generate a resonant signal with a frequency in a fourth preset range according to the pressure-sensitive 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, and is configured to generate a resonant power according to a power enable signal at a first level and a battery power.
The tuning module 11 is specifically configured to generate a wireless transmission signal and a resonant signal according to 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 pen entry 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, the tuning module 11 generates a resonant signal with a frequency in a fourth preset interval according to the electromagnetic induction characteristic; the frequency detection module 12 generates a pen-in wakeup signal according to the resonance signal with the frequency in the fourth preset interval and sends the pen-in wakeup 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 power enable signal of a first level according to the pen entry wake-up signal or the key wake-up signal, where the optional power enable signal of the first level is a power enable signal of a high level; the first power conversion module 101 generates a resonant power according to the high-level power enable signal and the battery power to supply power to the tuning module 11, so that the tuning module 11 enters a working state, and generates a wireless transmitting signal and a resonant signal according to the resonant power and the frequency adjusting signal.
This embodiment awakens up or button awakening signal makes only just awakening up control module when getting into the antenna radiation scope of electromagnetic screen or electromagnetism handwriting screen through going into a pen to control first power conversion module and convert battery power into resonance power and get into operating condition for tuning module power supply, thereby avoided tuning module to be in operating condition always and leaded to a large amount of energy loss, through the test the utility model discloses device running power consumption is less than 1 milliampere, and standby power consumption is less than 10 microamperes, makes active electromagnetic pen can realize overlength standby.
Referring to fig. 4, in one embodiment, the resonant signal conditioning device further includes a charging protection module 100.
The charging protection module 100 is connected to the control module 13, and is configured to generate a charging detection signal according to the charging power supply.
The control module 13 is further configured to generate a power enable signal of a second level 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, 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, and converts the battery power into a resonant power to supply power to the tuning module 11, that is, when resonance is not required, the power of the tuning module 11 is turned off, so that the influence of instability of the resonant power on components of the tuning module 11 caused by instability of the battery voltage during charging is avoided, the tuning module 11 is protected during charging, 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 tuning module and other functional modules are separately provided with the power supply, the tuning module is powered on only when the tuning module needs to work in a resonant mode, different power supply modules are arranged according to different power consumption requirements without the functional modules, and the lowest system working and standby power consumption is ensured.
Referring to fig. 6, in one embodiment, the resonance signal adjusting apparatus further includes a display module 15.
The display module 15 is connected to the control module 13 and configured to display the charging status and the operating status according to the charging display signal and the mode display signal. In specific implementation, besides the charging indication and the working state indication, the display module 15 can also perform alarm indication on the low-power state.
The embodiment of the utility model provides a show the charged state through display module, show the operating condition of difference to the user audio-visual understanding device of convenient to use and the state of electromagnetic pen in time remind the user to charge to 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 addition counter U2.
The non-inverting input of the first comparator U9-A and the inverting input of the first comparator U9-A together form the resonant signal input of the frequency detection module 12. The output terminal of the first comparator U9-a is the pen-in wake-up signal output terminal of the frequency detection module 12.
The reset terminal RST of the first addition counter U2 is the clear signal input terminal of the frequency detection module 12.
An output terminal of the first comparator U9-A is connected to a first terminal of a first resistor R1 and a clock terminal CLK of the first up counter U2, and a second terminal of the first resistor R1 is connected to a first power supply.
The setting end LD of the first addition counter U2, the first enable end P of the first addition counter U2, and the second enable end T of the first addition counter U2 are connected to a first power supply, the fourth output end Q3 of the first addition counter U2 is connected to a first end of a second resistor R2, and the second end of the second resistor R2 is a frequency count signal output end of the frequency detection module 12.
In a specific implementation, optionally, the first power supply is a 3V power supply. The first output terminal Q0 of the first addition counter U2, the second output terminal Q1 of the first addition counter U2, and the third output terminal Q2 of the first addition counter U2 may be left vacant, or may be connected to the power ground GND after being respectively connected to the third resistor R3, the fourth resistor R4, and the fifth resistor R5 in series.
Referring to fig. 7, in an 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 transistor Q1.
A first terminal of the second capacitor C2 is connected to the resonant power supply and a second terminal of the second capacitor C2 is connected to the power ground GND.
A first terminal of a seventh resistor R7, a first terminal of a first inductor L1, a first terminal of a third capacitor C3, a first common terminal COM1 of a first analog switch U1 and a second common terminal COM2 of a first analog switch U1 are connected to the resonant power supply, a second terminal of a seventh resistor R7 is connected to a first terminal of a ninth capacitor C9 and a first terminal of an eighth resistor R8 and a base of a first transistor Q1, a second terminal of the ninth capacitor C9 and a second terminal of an eighth resistor R8, a second terminal of a tenth resistor R10 and a second terminal of an eleventh capacitor C11 are connected to ground GND, an emitter of a first transistor Q1 is connected to a first terminal of a ninth resistor R9, a second terminal of a ninth resistor R9 is connected to a first terminal of a tenth resistor R10 and a first terminal of an eleventh capacitor C11, a second terminal of the first inductor L1 is connected to a second terminal of the third capacitor C3 and a second terminal of the fourth capacitor C3, a collector of the third resistor L3 and a second terminal 3 are connected to a second terminal of the third capacitor C3, a second terminal of the tenth capacitor C10 is connected to a first terminal of an eleventh 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 constitute a frequency adjustment signal input terminal of the tuner module 11.
A power supply terminal of the first analog switch U1 is connected to the second power supply, a first normally closed terminal NC1 of the first analog switch U1 is connected to a first terminal of the fifth capacitor C5, a first normally open terminal NO1 of the first analog switch U1 is connected to a first terminal of the sixth capacitor C6, a second normally open terminal NO2 of the first analog switch U1 is connected to a first terminal of the seventh capacitor C7, a second normally closed terminal NC2 of the first analog switch U1 is connected to a first terminal of the eighth capacitor C8, a second terminal of the fifth capacitor C5, a second terminal of the sixth capacitor C6, a second terminal of the seventh capacitor C7, and a second terminal of the eighth capacitor C8 are connected to a second terminal 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 resonant signal output terminal of the tuning module 11.
In specific implementation, optionally, the resonant power supply is 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 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 terminal PA7 of the microprocessor U3 is a key wake-up signal input terminal of the control module 13.
A second data input/output terminal PA10 of the microprocessor U3 is a clear signal output terminal of the control module 13.
The third data input/output terminal PA6 of the microprocessor U3 is a first level power enable signal output terminal of the control module 13 and a second level power enable signal output terminal of the control module 13.
The fourth data input/output terminal PA13 of the microprocessor U3 and the fifth data input/output terminal PA14 of the microprocessor U3 together form a frequency adjustment signal output terminal of the control module 13.
The sixth data input/output terminal PA4 of the microprocessor U3 is a charging display signal output terminal of the control module 13 and a mode display signal output terminal of the control module 13.
The seventh data input/output terminal PA9 of the microprocessor U3 is the frequency count signal input terminal of the control module 13.
An eighth data input/output terminal PA2 of the microprocessor U3 is the charge detection signal input terminal of the control module 13.
The ninth data input/output terminal PA15 of the microprocessor U3 is the pen-in wake-up signal input terminal of the control module 13.
In 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) chip, and the first power conversion module 101 includes a synchronous rectification chip, which can realize a quiescent current up to uA level, and the conversion efficiency of the resonant operating voltage is more than 93%.
The working principle of a resonant signal conditioning device will be further explained with reference to fig. 7:
the first inductor L1 is connected in parallel with a capacitor, a third capacitor C3 and a fourth capacitor C4, in parallel with a fourth capacitor C5, a fourth capacitor C6, a fourth capacitor C7 and a fourth capacitor C8 controlled by the first analog switch U1, and in parallel with a twelfth capacitor C12 and a 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 LC parallel resonant circuit has an oscillation frequency of
Wherein L is the inductance of the first inductanceThe quantity 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 resonance signal with a frequency in a fourth preset interval is generated through the LC parallel resonance circuit, the resonance signal with the frequency in the fourth preset interval is transmitted to the microprocessor U3 through the ninth data input and output end PA15 of the microprocessor U3 after passing through the first comparator U9-A, the microprocessor U3 generates a high-level power supply enable signal (DCDC _ EN) according to the pen entry wake signal (WKUP1), and the DC-to-DC conversion chip U4 of the first power conversion module 101 is controlled to convert the battery power supply VBAT into a resonance power supply (5V) to supply power to the LC parallel resonance circuit and the first analog switch U1 to enter a resonance and tuning working state.
When the electromagnetic pen writes, the pen point is pressed to generate displacement, the magnetic core is connected with the pen point, so that the magnetic core displaces relative to the coil, the inductance of the first inductor L1 changes, the calculation formula of the resonant frequency f can know that the resonant frequency changes, the changed frequency information is Z-axis pressure information, at the moment, the resonant signal generated by the tuning module 11 is transmitted out through the first inductor L1, 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 adjustment signal and a second frequency adjustment signal according to the frequency calculation signal, outputs the first frequency adjustment signal and the second frequency adjustment signal through a fourth data input/output terminal PA13 of the microprocessor U3 and a fifth data input/output terminal PA14 of the microprocessor U3, and transmits the first frequency adjustment signal and the second frequency adjustment signal to the first analog switch U1 through a first digital control terminal IN1 of the first analog switch U1 and a second digital control terminal IN2 of the first analog switch U1; the first analog switch U1 selectively couples a capacitor in parallel with the first inductor L1 based on the first frequency adjust signal and the second frequency adjust signal, thereby adjusting the resonance frequency of the LC parallel resonance circuit in real time, automatically adjusting the resonance frequency of the LC parallel resonance circuit to a stable range close to the preset frequency of the electromagnetic screen or the electromagnetic handwriting screen, realizing the automatic adjustment of the resonance frequency, adjusting the emission frequency of the active electromagnetic pen, avoiding the influence of element parameter deviation and environmental factors on the emission frequency of the electromagnetic pen, thereby lead to the writing position coordinate precision of electromagnetic pen low with the big defect of stroke pressure detection error, improved the resolution ratio that electromagnetic pen pressure sense precision and electromagnetic pen write, the electromagnetic pen writes coordinate positioning accuracy, writes and does not have the delay and trails, and the reliability user experience degree that the handwriting reduction degree was close true handwriting has been improved the electromagnetic pen and has been write is splendid. Meanwhile, the problems that the frequency is difficult to tune manually in the production process of the electromagnetic pen and the consistency of the resonant frequency is poor are solved.
When the device is detected to enter the antenna radiation range of the electromagnetic screen or the electromagnetic handwriting screen and the LC parallel resonant circuit does not generate a resonant signal with the frequency within the first preset range for more than the preset time, for example, the preset time is 30 minutes, the microprocessor U3 generates a low-level power supply enabling signal (DCDC _ EN), and cuts off the power supply (namely, the resonant power supply) of the LC parallel resonant circuit, so as to save energy consumption.
Pressing a first key switch SW1, merging an LC parallel resonance circuit into a twelfth capacitor C12, pressing a second key switch SW2, merging an LC parallel resonance 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, and simultaneously generating a key awakening signal (WKUP3), wherein 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 are wirelessly transmitted to an electromagnetic screen or an electromagnetic handwriting screen through a first inductor L1, and the wireless transmission signals are received and analyzed by the electromagnetic screen or the electromagnetic handwriting screen, so that related functional operations are performed through the first key switch SW1 and the second key switch SW 2; the microprocessor U3 receives the key wake-up signal (WKUP3) through the first data input/output terminal PA7 and generates a high-level power enable signal (DCDC _ EN) according to the key wake-up signal (WKUP3), 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 tank and the first analog switch U1 to enter a resonant and tuning operation state.
A second aspect of the embodiments of the present invention provides an electromagnetic pen, which includes a resonance signal adjusting device as described above.
The electromagnetic pen of this embodiment can realize resonant frequency self feedback and adjust, so that tuning module generates the resonant signal that frequency is located first preset interval, resonant frequency's automatically regulated has been realized, active electromagnetic pen transmitting frequency has been adjusted, the transmitting frequency that component parameter and environmental factor can influence the electromagnetic pen has been avoided, thereby lead to the writing position coordinate precision of electromagnetic pen low with the big defect of stroke detection error, the resolution ratio that electromagnetic pen pressure sense precision and electromagnetic pen write has been improved, the electromagnetic pen writes coordinate positioning accuracy, write the no delay and train tail, the handwriting reduction degree is close true handwriting, user experience degree is splendid, the reliability that the electromagnetic pen writes has been improved. Meanwhile, the problems that the frequency is difficult to tune manually in the production process of the electromagnetic pen and the consistency of the resonant frequency is poor are solved.
The utility model discloses the third aspect of embodiment provides an electromagnetism handwriting screen system, including the electromagnetism handwriting screen that has sending coil and receiving coil, electromagnetism handwriting screen system still includes as above-mentioned the electromagnetism pen.
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, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A resonant signal conditioning device, comprising:
the tuning module is used for generating a wireless transmitting signal and a resonant signal according to the frequency adjusting 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;
and the control module is connected with the tuning module and the frequency detection module and used for generating the zero clearing signal and the frequency adjusting signal according to the frequency counting signal so as to enable the frequency of the resonance signal generated by the tuning module according to the frequency adjusting signal to be positioned in a first preset interval.
2. The resonant signal conditioning device of claim 1, further comprising:
the key module is connected with the tuning module and the control module and 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 transmitting signal with a frequency in a second preset interval according to the frequency adjusting signal and the first key signal, and generate a wireless transmitting signal with a frequency in a third preset interval according to the frequency adjusting signal and the second key signal.
3. The resonant signal conditioning device of claim 2, wherein the tuning module is further configured to generate the resonant signal having a frequency within a fourth predetermined interval;
the resonance signal adjusting apparatus further includes:
the first power supply conversion module is connected with the tuning module and used for generating a resonant power supply according to a power supply enabling signal of a first level and a 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 wakeup signal according to the resonance signal;
the control module is further configured to generate a key wakeup signal according to the first key signal or the second key signal, and generate a power enable signal of the first level according to the pen entry wakeup signal or the key wakeup signal.
4. The resonant signal conditioning device of claim 1, further comprising:
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 the power supply enabling signal of a second level according to the charging detection signal;
and the first power supply conversion module stops generating the resonant power supply according to the power supply enabling signal of the second level.
5. The resonant signal conditioning device of claim 1, further comprising:
and the second power supply conversion module is used for generating a power supply according to the battery power supply to supply power to each functional module.
6. The resonance signal adjusting apparatus of claim 1, wherein the frequency detecting module includes 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-direction input end of the first comparator are jointly formed as the resonant 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 the 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 frequency detection module comprises a first addition counter, a second addition counter, a first power supply, a second power supply, a fourth output end of the first addition counter, a frequency counting signal output end of the frequency detection module, a number setting end of the first addition counter, a first enabling end of the first addition counter and a second enabling end of the first addition counter are connected with the first power supply, a fourth output end of the first addition counter is connected with a first end of a second resistor, and a second end of the second resistor is a frequency counting signal output end of the frequency detection module.
7. The resonant signal conditioning device of claim 1, wherein 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 transistor;
the first end of the second capacitor is connected with the resonant power supply, and the second end of the second capacitor is connected with the power ground;
a first end of the seventh resistor, a first end of the first inductor, a first end of the third capacitor, a first common end of the first analog switch, and a second common end of the first analog switch are connected to the resonant power supply, a second end of the seventh resistor is connected to a first end of the ninth capacitor, a first end of the eighth resistor, and a base of the first transistor, a second end of the ninth capacitor, a second end of the eighth resistor, a second end of the tenth resistor, and a second end of the eleventh capacitor are connected to a power ground, an emitter of the first transistor is connected to a first end of the ninth resistor, a second end of the ninth resistor is connected to a first end of the tenth resistor and a first end of the eleventh capacitor, a second end of the first inductor is connected to a second end of the third capacitor and a collector of the first transistor, a second terminal of the fourth capacitor is connected to a second terminal of the third capacitor and a first terminal of the tenth capacitor, and a second terminal of the tenth capacitor is connected to a first terminal of the eleventh capacitor;
a first digital control end of the first analog switch and a second digital control end of the first analog switch are jointly formed into a frequency adjusting signal input end of the tuning module;
a power supply end of the first analog switch is connected with a second power supply, a first normally closed end of the first analog switch is connected with a first end of the fifth capacitor, a first normally opened end of the first analog switch is connected with a first end of the sixth capacitor, a second normally opened end of the first analog switch is connected with a first end of the seventh capacitor, a second normally closed end of the first analog switch is connected with a first end of the eighth capacitor, and a second end of the fifth capacitor, a second end of the sixth capacitor, a second end of the seventh capacitor and a second end of the eighth capacitor are connected with a second end of the fourth capacitor;
the second end of the eighth capacitor, the first common end of the first analog switch and the second common end of the first analog switch are jointly formed as a resonant signal output end of the tuning module.
8. The resonant signal conditioning device of claim 1, wherein the control module comprises a microprocessor, a sixth resistor, and a first capacitor;
the reset end of the microprocessor 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 a power ground, and the second end of the sixth resistor is connected with a third power supply;
the analog power supply end of the microprocessor is connected with the third power supply, the power supply end of the microprocessor is connected with the third power supply, and the ground end of the microprocessor is connected with a 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 power supply enabling signal output end of the first level of the control module and a power supply enabling signal output end of the second level of the control module; a fourth data input and output end of the microprocessor and a fifth data input and output end of the microprocessor are jointly formed into a frequency adjusting signal output end of the control module;
a sixth data input/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;
a seventh data input and output end of the microprocessor is a frequency counting signal input end of the control module;
an eighth data input/output end of the microprocessor is a charging detection signal input end of the control module;
and a ninth data input/output end of the microprocessor is an input end of the pen-in wake-up signal of the control module.
9. An electromagnetic pen, characterized in that it comprises a resonance signal adjusting device according to any one of claims 1 to 8.
10. An electromagnetic handwriting screen system comprising an electromagnetic handwriting screen having a transmit coil and a receive coil, characterized in that said electromagnetic handwriting screen system further comprises an electromagnetic pen according to claim 9.
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| CN201920856455.1U CN209962227U (en) | 2019-06-06 | 2019-06-06 | Resonance signal adjusting device, electromagnetic pen and electromagnetic handwriting screen system |
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| CN201920856455.1U CN209962227U (en) | 2019-06-06 | 2019-06-06 | Resonance signal adjusting device, electromagnetic pen and electromagnetic handwriting screen system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262676A (en) * | 2019-06-06 | 2019-09-20 | 深圳市优笔触控科技有限公司 | A kind of resonance signal regulating device, time writer and electromagnetic handwritten screen system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262676A (en) * | 2019-06-06 | 2019-09-20 | 深圳市优笔触控科技有限公司 | A kind of resonance signal regulating device, time writer and electromagnetic handwritten screen system |
| CN110262676B (en) * | 2019-06-06 | 2024-04-26 | 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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