CN110413160B - Electromagnetic touch device and driving circuit thereof - Google Patents
Electromagnetic touch device and driving circuit thereof Download PDFInfo
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- CN110413160B CN110413160B CN201910684552.1A CN201910684552A CN110413160B CN 110413160 B CN110413160 B CN 110413160B CN 201910684552 A CN201910684552 A CN 201910684552A CN 110413160 B CN110413160 B CN 110413160B
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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
- G06F3/041—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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Abstract
The invention discloses an electromagnetic touch device, wherein a driving circuit of the electromagnetic touch device comprises a power supply control and delay unit, a boosting and low voltage detection unit, a resonant circuit and a transmitting power regulation unit, wherein the resonant circuit comprises an inductor L1, a resistor R1, a capacitor C1 and a triode Q1, and the power supply control and delay unit comprises a MOS tube Q2, a resistor R5 and a battery E. According to the electromagnetic touch device and the driving circuit thereof, the electromagnetic emission power of the electromagnetic pen can be adjusted according to different distances between the electromagnetic pen point and the position sensing plate, and the energy consumption of the electromagnetic pen can be greatly saved.
Description
Technical Field
The invention relates to the field of electromagnetic touch control, in particular to an electromagnetic touch control device and a driving circuit thereof.
Background
The active electromagnetic touch technology refers to a pen with a battery and an oscillating wave generating circuit, and generates electromagnetic waves with variable frequency. The battery power supply outputs current, and the current passes through the boosting unit and outputs fixed voltage to the LC oscillating circuit so as to maintain the LC oscillating circuit to output electromagnetic waves with variable frequency and constant power. The change in frequency is achieved by a variable capacitance or a variable inductance.
Educational writing pads typically place paper over a touch sensitive pad, and electronically collect, store, forward, or otherwise process writing trajectories while writing with an ink pen. The thickness of the paper can be changed from 0.1 to 10 mm (the thickness of a piece of paper is about 0.1 mm), so that the distance between the electromagnetic pen point and the position sensing plate is different, but the current active electromagnetic pen emits electromagnetic waves with fixed power, so that the highest sensing position is considered, the emission power of the pen is larger, and the waste of the emission power of the pen is caused.
Disclosure of Invention
The present invention is directed to an electromagnetic touch device and a driving circuit thereof, so as to solve the problems set forth in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an electromagnetic touch device comprises a position sensing device and an electromagnetic pen, wherein the position sensing device can emit power electromagnetic waves in a receiving gap besides receiving the electromagnetic waves emitted by the electromagnetic pen, and two electromagnetic coils are arranged in the electromagnetic pen: an electromagnetic transmitting coil L1 and an electromagnetic receiving coil L0; after the position sensing device senses that the electromagnetic pen is pressed down, power electromagnetic waves are emitted at a receiving gap with the frequency f1, an electromagnetic receiving coil L0 in the electromagnetic pen and a capacitor C0 form a resonance unit, the resonance frequency is f1, the received electromagnetic waves enter comparators U1, U2, U3, U4 and U5 after being rectified and filtered, and then electronic switches K1, K2, K3 and K4 are driven to adjust the output voltage of the boosting and low-voltage detection unit, so that the output power of the electromagnetic pen is adjusted.
As a further scheme of the invention: the driving circuit of the electromagnetic touch device comprises a power supply control and delay unit, a boosting and low-voltage detection unit, a resonant circuit and a transmitting power regulation unit, wherein the resonant circuit comprises an inductor L1, a resistor R1, a capacitor C1 and a triode Q1, the power supply control and delay unit comprises a MOS tube Q2, a resistor R5 and a battery E, the positive electrode of the battery E is respectively connected with the positive electrode of a diode D, a resistor R6 and the S electrode of the MOS tube Q3, the negative electrode of the diode D is connected with the resistor R5, the other end of the resistor R5 is connected with a switch S3, the other end of the switch S3 is connected with the G electrode of the MOS tube Q1, the S electrode of the MOS tube Q2 is connected with a capacitor C9 and grounded, the other end of the capacitor C9 is respectively connected with the other end of the resistor R7, the resistor R6 and the G electrode of the MOS tube Q3, the D electrode of the MOS tube Q3 is respectively connected with a resistor R8, a grounding capacitor C10, the input end of the transmitting power regulation unit and the input end of the boosting and low-voltage detection unit, the other end of the resistor R8 is respectively connected with the grounding end of the boosting and low-voltage detection unit and the resistor R9, the other end of the resistor R9 is connected with the negative electrode of the battery E and the grounding end of the battery E, the output end of the boosting and low-voltage detection unit is respectively connected with the switch S1, the switch S2, the capacitor C3, the capacitor C2, the inductor L1, the resistor R1 and the grounding capacitor C1, the other end of the switch S2 is connected with the capacitor C5, the other end of the switch S1 is connected with the capacitor C4, the other end of the capacitor C4 is respectively connected with the other end of the capacitor C5, the other end of the capacitor C3, the other end of the capacitor C2, the other end of the inductor L1, the collector of the triode Q1 and the capacitor C7, the other end of the capacitor C7 is respectively connected with the capacitor C8, the resistor R3 and the resistor R4, the other end of the resistor R3 is connected with the emitter of the triode Q1, the other end of the resistor R4 is respectively connected with the other end of the capacitor C8, the resistor R2 and the capacitor C6 and the grounding end, the other end of the capacitor C6 is respectively connected with the other end of the resistor R1, the other end of the resistor R2 and the base electrode of the triode Q1; the boosting and low-voltage detection unit is used for boosting the power supply control and delay unit and receiving voltage feedback of the emission power regulation unit.
As still further aspects of the invention: the switch S3 is a silica gel switch, when the electromagnetic pen is pressed to start writing, the switch S3 is turned on, then the current of the battery E is conducted to the boosting and low-voltage detection unit through the MOS tubes Q2 and Q3, when the pen point of the electromagnetic pen is lifted, the switch S3 is turned off, and the capacitor C9 and the resistor R7 form a delay circuit, so that the MOS tube Q3 cannot be turned off immediately, and is turned off in a delayed manner.
As still further aspects of the invention: the emission power regulating unit comprises a capacitor C0 and an inductor L0, the capacitor C0 and the inductor L0 are connected in parallel and then connected to the positive electrode of a diode D1, the negative electrode of the diode D1 is respectively connected with a resistor R11, a capacitor C12, a resistor R12 and an operational amplifier U1 in-phase end, the other end of the resistor R11 is connected with the other end of the capacitor C12 and grounded, the other end of the resistor R12 is respectively connected with an operational amplifier U2 in-phase end and a resistor R13, the other end of the resistor R13 is respectively connected with an operational amplifier U3 in-phase end and a resistor R14, the other end of the resistor R14 is respectively connected with an operational amplifier U4 in-phase end and a resistor R15, the other end of the resistor R15 is respectively connected with an operational amplifier U5 in-phase end and a grounding resistor R16, the operational amplifier U1 in-phase end is respectively connected with an operational amplifier U2 in-phase end, an operational amplifier U3 in-phase end, an operational amplifier U4 in-phase end and an operational amplifier U5 in-phase end, an operational amplifier U1 in-phase end respectively connected with a first input end of a NAND gate U6, a first input end of a NAND gate U7, a first input end of an NAND gate U9, and a first input end, and an output end of an operational amplifier U1 respectively, the output end of the operational amplifier U2 is connected with the second input end of the NAND gate U6, the output end of the operational amplifier U3 is connected with the second input end of the NAND gate U7, the output end of the operational amplifier U4 is connected with the second input end of the NAND gate U8, the output end of the operational amplifier U5 is connected with the second input end of the NAND gate U9, the output end of the NAND gate U6 is connected with the control end of the electronic switch K1, the output end of the NAND gate U8 is connected with the control end of the electronic switch K3, the output end of the NAND gate U9 is connected with the control end of the electronic switch K4, the electronic switch K1 is respectively connected with the electronic switch K2, the electronic switch K3, the electronic switch K4, the resistor R21 and the output end of the boosting and low-voltage detecting unit, the other end of the electronic switch K1 is connected with the resistor R17, the other end of the electronic switch K2 is connected with the resistor R18, the other end of the electronic switch K3 is connected with the resistor R19, the other end of the electronic switch K4 is respectively connected with the resistor R20, the other end of the resistor R21 is respectively connected with the resistor R17, the other end of the resistor R18, the other end of the resistor R19, the other end of the resistor R20, the grounding resistor R22 and the voltage feedback end FB of the boosting and low-voltage detecting unit.
Compared with the prior art, the invention has the beneficial effects that: according to the electromagnetic touch device and the driving circuit thereof, the electromagnetic emission power of the electromagnetic pen can be adjusted according to different distances between the electromagnetic pen point and the position sensing plate, and the energy consumption of the electromagnetic pen can be greatly saved.
Drawings
Fig. 1 is a schematic circuit diagram of a driving circuit of an electromagnetic touch device.
Fig. 2 is a schematic structural diagram of a transmitting power adjusting unit in a driving circuit of an electromagnetic touch device.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
An electromagnetic touch device comprises a position sensing device and an electromagnetic pen, wherein the position sensing device can emit power electromagnetic waves in a receiving gap besides receiving the electromagnetic waves emitted by the electromagnetic pen, and two electromagnetic coils are arranged in the electromagnetic pen: an electromagnetic transmitting coil L1 and an electromagnetic receiving coil L0; after the position sensing device senses that the electromagnetic pen is pressed down, power electromagnetic waves are emitted at a receiving gap with the frequency f1, an electromagnetic receiving coil L0 in the electromagnetic pen and a capacitor C0 form a resonance unit, the resonance frequency is f1, the received electromagnetic waves enter comparators U1, U2, U3, U4 and U5 after being rectified and filtered, and then electronic switches K1, K2, K3 and K4 are driven to adjust the output voltage of the boosting and low-voltage detection unit, so that the output power of the electromagnetic pen is adjusted.
The driving circuit of the electromagnetic touch device comprises a power supply control and delay unit, a boosting and low-voltage detection unit, a resonant circuit and a transmitting power regulation unit, wherein the resonant circuit comprises an inductor L1, a resistor R1, a capacitor C1 and a triode Q1, the power supply control and delay unit comprises a MOS tube Q2, a resistor R5 and a battery E, the positive electrode of the battery E is respectively connected with the positive electrode of a diode D, a resistor R6 and the S electrode of the MOS tube Q3, the negative electrode of the diode D is connected with the resistor R5, the other end of the resistor R5 is connected with a switch S3, the other end of the switch S3 is connected with the G electrode of the MOS tube Q1, the S electrode of the MOS tube Q2 is connected with a capacitor C9 and grounded, the other end of the capacitor C9 is respectively connected with the other end of the resistor R7, the resistor R6 and the G electrode of the MOS tube Q3, the D electrode of the MOS tube Q3 is respectively connected with a resistor R8, a grounding capacitor C10, the input end of the transmitting power regulation unit and the input end of the boosting and low-voltage detection unit, the other end of the resistor R8 is respectively connected with the grounding end of the boosting and low-voltage detection unit and the resistor R9, the other end of the resistor R9 is connected with the negative electrode of the battery E and the grounding end of the battery E, the output end of the boosting and low-voltage detection unit is respectively connected with the switch S1, the switch S2, the capacitor C3, the capacitor C2, the inductor L1, the resistor R1 and the grounding capacitor C1, the other end of the switch S2 is connected with the capacitor C5, the other end of the switch S1 is connected with the capacitor C4, the other end of the capacitor C4 is respectively connected with the other end of the capacitor C5, the other end of the capacitor C3, the other end of the capacitor C2, the other end of the inductor L1, the collector of the triode Q1 and the capacitor C7, the other end of the capacitor C7 is respectively connected with the capacitor C8, the resistor R3 and the resistor R4, the other end of the resistor R3 is connected with the emitter of the triode Q1, the other end of the resistor R4 is respectively connected with the other end of the capacitor C8, the resistor R2 and the capacitor C6 and the grounding end, the other end of the capacitor C6 is respectively connected with the other end of the resistor R1, the other end of the resistor R2 and the base electrode of the triode Q1; the boosting and low-voltage detection unit is used for boosting the power supply control and delay unit and receiving voltage feedback of the emission power regulation unit.
Fig. 2 is a circuit diagram of a transmitting power adjusting unit of the present invention, which includes a capacitor C0 and an inductor L0, the capacitor C0 and the inductor L0 are connected in parallel and then connected to the positive electrode of a diode D1, the negative electrode of the diode D1 is respectively connected to a resistor R11, a capacitor C12, a resistor R12 and an operational amplifier U1 non-inverting terminal, the other end of the resistor R11 is connected to the other end of the capacitor C12 and grounded, the other end of the resistor R12 is respectively connected to an operational amplifier U2 non-inverting terminal and a resistor R13, the other end of the resistor R13 is respectively connected to an operational amplifier U3 non-inverting terminal and a resistor R14, the other end of the resistor R14 is respectively connected to an operational amplifier U4 non-inverting terminal and a resistor R15, the inverting terminal of the operational amplifier U1 is respectively connected to an operational amplifier U2 non-inverting terminal, an operational amplifier U3 non-inverting terminal, an operational amplifier U4 non-inverting terminal, an operational amplifier U5 non-inverting terminal, an operational amplifier U1 output terminal are respectively connected to a first input terminal of a nand gate U6, a first input terminal of a nand gate U7, a first input terminal of a nand gate U8, a first input terminal of a nand gate U9, the output end of the operational amplifier U2 is connected with the second input end of the NAND gate U6, the output end of the operational amplifier U3 is connected with the second input end of the NAND gate U7, the output end of the operational amplifier U4 is connected with the second input end of the NAND gate U8, the output end of the operational amplifier U5 is connected with the second input end of the NAND gate U9, the output end of the NAND gate U6 is connected with the control end of the electronic switch K1, the output end of the NAND gate U8 is connected with the control end of the electronic switch K3, the output end of the NAND gate U9 is connected with the control end of the electronic switch K4, the electronic switch K1 is respectively connected with the electronic switch K2, the electronic switch K3, the electronic switch K4, the resistor R21 and the output end of the boosting and low-voltage detecting unit, the other end of the electronic switch K1 is connected with the resistor R17, the other end of the electronic switch K2 is connected with the resistor R18, the other end of the electronic switch K3 is connected with the resistor R19, the other end of the electronic switch K4 is connected with the resistor R20, the other end of the resistor R21 is respectively connected with the other end of the resistor R17, the other end of the resistor R18, the other end of the resistor R19, the other end of the resistor R20, the grounding resistor R22 and the voltage feedback end FB of the boosting and low-voltage detection unit.
In order to receive the power electromagnetic signal from the position sensing end, a second coil L0 is arranged in the pen, and the second coil L1 and the first coil L1 can share a magnetic core for saving space. L0 and C0 form a resonant circuit, the resonant frequency of the resonant circuit is consistent with that of a power electromagnetic signal, the power electromagnetic signal generates resonance in the resonant circuit, the resonance signal enters a step-by-step comparator U1-U5 after being rectified and filtered by a diode D1 and a capacitor C12, the comparison voltage is converted from the working voltage Vsys of the oscillating circuit through an LDO (low dropout linear regulator), U6-U9 forms a D trigger, the FB signal is used for controlling the boost control of a boost and low voltage detection unit, and the boost output formula is as follows: vout= 1.229Vsys (1+r/R22). Wherein R can be R21 or R21 and one or more of R17, R18, R19 and R20 are connected in parallel. In the figure, K1, K2, K3 and K4 are electronic switches, and the output of the D flip-flop can control the switch to be turned on and off, when the output of the D flip-flop is high, the switch is turned on, otherwise, the switch is turned off. When the pen enters the position sensing area every time and when the pen point is pressed down, the position sensing plate transmits a group of power electromagnetic signals to the pen by using the coil on the position sensing plate, when the pen is closer to the position sensing plate, the voltage value sensed by the resonant circuit L0 and the capacitor C0 is higher, and when the trigger is triggered, the number of the switches in K1-K4 is more, so that the parallel resistance value R is smaller, the output power is reduced, and the effect of adjusting the output power is achieved. In actual use, the number of parallel resistors n=m+1, M is the number of cascaded comparators, and the value of M can be adjusted according to actual use needs.
The switch S3 is a silica gel switch, when the electromagnetic pen is pressed to start writing, the switch S3 is turned on, then the current of the battery E is conducted to the boosting and low-voltage detection unit through the MOS tubes Q2 and Q3, when the pen point of the electromagnetic pen is lifted, the switch S3 is turned off, the capacitor C9 and the resistor R7 form a delay circuit, so that the MOS tube Q3 cannot be immediately turned off, but is turned off in a delay manner, and the current is prevented from being turned off frequently, and the next pen entering detection is prevented from being influenced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (1)
1. The electromagnetic touch device comprises a driving circuit, wherein the driving circuit comprises a power supply control and delay unit, a boosting and low voltage detection unit, a resonant circuit and a transmitting power adjusting unit, and is characterized by further comprising a position sensing device and an electromagnetic pen, wherein the position sensing device can not only receive electromagnetic waves transmitted by the electromagnetic pen, but also transmit power electromagnetic waves in a receiving gap, and two electromagnetic coils are arranged in the electromagnetic pen: an electromagnetic transmitting coil L1 and an electromagnetic receiving coil L0; after the position sensing device senses that the electromagnetic pen is pressed down, transmitting power electromagnetic waves at a frequency f1 in a receiving gap, forming a resonant unit by an electromagnetic receiving coil L0 and a capacitor C0 in the electromagnetic pen, rectifying and filtering the received electromagnetic waves at the resonant frequency f1, entering comparators U1, U2, U3, U4 and U5, and driving electronic switches K1, K2, K3 and K4 to adjust the output voltage of the boosting and low-voltage detection unit so as to adjust the output power of the electromagnetic pen;
the resonant circuit comprises an inductor L1, a resistor R1, a capacitor C1 and a triode Q1, the power supply control and delay unit comprises a MOS tube Q2, a resistor R5 and a battery E, the positive electrode of the battery E is respectively connected with the positive electrode of a diode D, the resistor R6 and the S electrode of a MOS tube Q3, the negative electrode of the diode D is connected with the resistor R5, the other end of the resistor R5 is connected with a switch S3, the other end of the switch S3 is connected with the G electrode of the MOS tube Q1, the S electrode of the MOS tube Q2 is connected with a capacitor C9 and grounded, the other end of the capacitor C9 is respectively connected with the other end of the resistor R7, the resistor R6 and the G electrode of the MOS tube Q3, the D electrode of the MOS tube Q3 is respectively connected with a resistor R8, a grounding capacitor C10, the input end of a transmitting power adjusting unit and the input end of a boosting and low voltage detecting unit,
the other end of the resistor R8 is respectively connected with the grounding end of the boosting and low-voltage detection unit and the resistor R9, the other end of the resistor R9 is connected with the negative electrode of the battery E and the grounding end of the battery E, the output end of the boosting and low-voltage detection unit is respectively connected with the switch S1, the switch S2, the capacitor C3, the capacitor C2, the inductor L1, the resistor R1 and the grounding capacitor C1, the other end of the switch S2 is connected with the capacitor C5, the other end of the switch S1 is connected with the capacitor C4, the other end of the capacitor C3, the other end of the capacitor C2, the other end of the inductor L1, the collector of the triode Q1 and the capacitor C7, the other end of the capacitor C7 is respectively connected with the capacitor C8, the resistor R3 and the resistor R4, the other end of the resistor R3 is respectively connected with the other end of the base of the capacitor C8, the resistor R2 and the capacitor C6 and the grounding end of the resistor C1, and the other end of the resistor R2 and the triode Q1 are respectively connected with the other end of the resistor R1; the boosting and low-voltage detection unit is used for boosting the power supply control and delay unit and receiving voltage feedback of the emission power regulation unit;
the switch S3 is a silica gel switch, when the electromagnetic pen is pressed to start writing, the switch S3 is turned on, then the current of the battery E is conducted to the boosting and low-voltage detection unit through the MOS tubes Q2 and Q3, when the pen point of the electromagnetic pen is lifted, the switch S3 is turned off, and the capacitor C9 and the resistor R7 form a delay circuit, so that the MOS tube Q3 is not turned off immediately but turned off in a delayed manner;
the emission power regulating unit comprises a capacitor C0 and an inductor L0, the capacitor C0 and the inductor L0 are connected in parallel and then connected to the positive electrode of a diode D1, the negative electrode of the diode D1 is respectively connected with a resistor R11, a capacitor C12, a resistor R12 and an operational amplifier U1 in-phase end, the other end of the resistor R11 is connected with the other end of the capacitor C12 and grounded, the other end of the resistor R12 is respectively connected with an operational amplifier U2 in-phase end and a resistor R13, the other end of the resistor R13 is respectively connected with an operational amplifier U3 in-phase end and a resistor R14, the other end of the resistor R14 is respectively connected with an operational amplifier U4 in-phase end and a resistor R15, the other end of the resistor R15 is respectively connected with an operational amplifier U5 in-phase end and a grounding resistor R16, the operational amplifier U1 in-phase end is respectively connected with an operational amplifier U2 in-phase end, an operational amplifier U3 in-phase end, an operational amplifier U4 in-phase end and an operational amplifier U5 in-phase end, an operational amplifier U1 in-phase end respectively connected with a first input end of a NAND gate U6, a first input end of a NAND gate U7, a first input end of an NAND gate U9, and a first input end, and an output end of an operational amplifier U1 respectively, the output end of the operational amplifier U2 is connected with the second input end of the NAND gate U6, the output end of the operational amplifier U3 is connected with the second input end of the NAND gate U7, the output end of the operational amplifier U4 is connected with the second input end of the NAND gate U8, the output end of the operational amplifier U5 is connected with the second input end of the NAND gate U9, the output end of the NAND gate U6 is connected with the control end of the electronic switch K1, the output end of the NAND gate U8 is connected with the control end of the electronic switch K3, the output end of the NAND gate U9 is connected with the control end of the electronic switch K4, the electronic switch K1 is respectively connected with the electronic switch K2, the electronic switch K3, the electronic switch K4, the resistor R21 and the output end of the boosting and low-voltage detecting unit, the other end of the electronic switch K1 is connected with the resistor R17, the other end of the electronic switch K2 is connected with the resistor R18, the other end of the electronic switch K3 is connected with the resistor R19, the other end of the electronic switch K4 is respectively connected with the resistor R20, the other end of the resistor R21 is respectively connected with the resistor R17, the other end of the resistor R18, the other end of the resistor R19, the other end of the resistor R20, the grounding resistor R22 and the voltage feedback end FB of the boosting and low-voltage detecting unit.
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| CN101957706A (en) * | 2010-09-30 | 2011-01-26 | 汉王科技股份有限公司 | Electromagnetic handwritten device |
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| CN107621895A (en) * | 2017-10-31 | 2018-01-23 | 深圳市精源宇科技有限公司 | Electromagnetic input device |
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| US8994641B2 (en) * | 2011-08-31 | 2015-03-31 | Lenovo (Singapore) Pte. Ltd. | Information handling devices with touch-based reflective display |
| JP6713772B2 (en) * | 2016-01-06 | 2020-06-24 | 株式会社ワコム | Position indicator and position indicating method |
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|---|---|---|---|---|
| CN101957706A (en) * | 2010-09-30 | 2011-01-26 | 汉王科技股份有限公司 | Electromagnetic handwritten device |
| CN105786218A (en) * | 2014-12-24 | 2016-07-20 | 北京汉王鹏泰科技有限公司 | Electromagnetic pen, and electromagnetic pen resonance frequency regulation system and method |
| CN105786290A (en) * | 2016-04-28 | 2016-07-20 | 京东方科技集团股份有限公司 | Touch sensing device, touch panel, display panel and display device |
| CN107621895A (en) * | 2017-10-31 | 2018-01-23 | 深圳市精源宇科技有限公司 | Electromagnetic input device |
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