CN210807073U - Output voltage adjustable coding circuit for active pen and active pen - Google Patents
Output voltage adjustable coding circuit for active pen and active pen Download PDFInfo
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- CN210807073U CN210807073U CN201922220384.9U CN201922220384U CN210807073U CN 210807073 U CN210807073 U CN 210807073U CN 201922220384 U CN201922220384 U CN 201922220384U CN 210807073 U CN210807073 U CN 210807073U
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Abstract
The utility model provides an output voltage adjustable beats sign indicating number circuit and initiative pen for initiative pen, beat the sign indicating number circuit and include inductance L, electric capacity C, switch S1, switch S2, switch S3, resistance R1, resistance R2, resistance R3 and resistance R4, the output of voltage conversion chip is connected with the LC resonance circuit that inductance L, electric capacity C establish ties and constitute, resistance R2, resistance R1 ' S series circuit are parallelly connected with electric capacity C ' S both ends, resistance R2, resistance R1 ' S tie point are connected with the FB end of voltage conversion chip; a resistor R3 and a resistor R4 are respectively connected in parallel or in series beside the resistors R1 and R2, and whether the resistors are connected into the circuit is respectively controlled through a switch S1 and a switch S2; the switch S1 and the switch S2 are electrically connected with the control module. The technical scheme of the utility model, the output voltage of the code printing circuit is adjustable, and the power consumption is reduced as much as possible under the normal writing condition of the certificate; and has better resistance to environmental noise.
Description
Technical Field
The utility model relates to a beat the sign indicating number circuit, especially relate to an output voltage adjustable beats sign indicating number circuit and initiative pen for initiative pen.
Background
The current scheme for realizing coding is mainly to adopt an LC resonance circuit, namely, a resonance circuit formed by connecting an inductor and a capacitor in series, a power supply in an active pen provides energy for the LC oscillation circuit, and the LC resonance circuit outputs coding pulses to a pen point. However, the voltage output by the traditional scheme is fixed and non-adjustable, and the power consumption cannot be reduced; meanwhile, when the environmental noise is large, the signal-to-noise ratio is reduced due to the fact that the coding voltage is fixed, and abnormal writing on a screen can be caused. In addition, in the coding circuit in the prior art, the requirement on the synchronism of control signals is strict; different touch-control screens have the difference to the requirement of typing the voltage, and the noise signal of equidimension also can be introduced to service environment, if adopt fixed output voltage can cause to write and appear unusually.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model discloses an output voltage adjustable beats sign indicating number circuit and initiative pen for initiative pen beats the adjustment easy control of sign indicating number voltage, can reduce the consumption as far as possible under the normal condition of guaranteeing to write.
To this end, the technical scheme of the utility model is that:
a code printing circuit with adjustable output voltage for an active pen is disclosed, wherein the active pen comprises a power module, a communication module, a control module, a code printing circuit and an input module, and the power module, the communication module, the input module and the code printing circuit are respectively connected with the control module; the power supply module comprises a battery and a voltage conversion chip; the coding circuit comprises an inductor L, a capacitor C, a switch S1, a switch S2, a switch S3, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the output end of the voltage conversion chip is connected with an LC resonance circuit formed by serially connecting the inductor L and the capacitor C, a serial circuit of the resistor R2 and the resistor R1 is connected with two ends of the capacitor C in parallel, and the connection point of the resistor R2 and the resistor R1 is connected with the FB end of the voltage conversion chip;
a resistor R3 and a resistor R4 are respectively connected in parallel or in series beside the resistors R1 and R2, and whether the resistors are connected into the circuit is respectively controlled through a switch S1 and a switch S2; the switch S1 and the switch S2 are electrically connected with the control module.
Wherein, power module provides the energy for the circuit, can be dry battery, lithium cell, super capacitor etc.. The communication module is used for interacting with the touch screen and transmitting the information whether the touch screen writes normally to the control module. The coding circuit can output coding signals with different amplitudes. The input module may be a key for direct interaction between the user and the active pen.
By adopting the technical scheme, the inductor L and the capacitor C are used for storing energy, the voltage VFB of the FB pin is usually a fixed value, the output voltage U is VFB (1+ R2/R1), and the resistors R3 and R4 are respectively connected in parallel or in series beside the resistors R1 and R2, so that whether the resistors are connected into a circuit or not can be respectively controlled by controlling the switch S1 and the switch S2, and four different voltage values are generated. The states of the switches S1, S2 may be controlled by the control module. Wherein the parallel (or series) resistance can be more in order to distinguish more voltage levels. In actual design, because the main application objects of different pens are different, a designer needs to design the upper limit and the lower limit of the coding voltage, the voltage difference between each level and the number of the voltage levels by himself. The design needs to pay attention to the fact that the inductor L and the capacitor C are designed according to the highest voltage of the output, and otherwise circuit failure can be caused.
As a further improvement of the utility model, inductance L is connected the back with beating sign indicating number signal output end with switch S3 and is connected, switch S3 still passes through resistance R5 ground connection. The resistor R5 prevents direct ground from causing short circuits, and facilitates the control of the duration of the rising edge of the coded signal.
Furthermore, one end of the inductor L is connected to an output end of the voltage conversion chip, the other end of the inductor L is connected to one end of the resistor R2, one end of the resistor R4, one end of the capacitor C, and one end of the switch S3, the other end of the switch S3 is connected to the code signal output end and one end of the resistor R5, the other end of the resistor R4 is connected to one end of the switch S2, the other end of the resistor R2 and the other end of the switch S2 are connected to the FB end of the voltage conversion chip, the FB end of the voltage conversion chip is further connected to one end of the resistor R1 and one end of the resistor R3, the other end of the resistor R3 is connected to one end of the switch S1, and the other end of the resistor R1, the other end of the switch S1, the other end of the resistor R3, and.
Furthermore, one end of the inductor L is connected to an output end of the voltage conversion chip, the other end of the inductor L is connected to a series circuit of a resistor R4, a resistor R2, a capacitor C, and a switch S3, two ends of the resistor R4 are connected in parallel to the switch S2, the resistor R2 is connected to an FB end of the voltage conversion chip, the FB end of the voltage conversion chip is also connected in series with the resistor R3 and the resistor R1 and then grounded, and two ends of the resistor R1 are connected in parallel to the switch S1; the capacitor C is grounded; the switch S3 is connected with the code signal output end, and the switch S3 is also grounded through a resistor R5.
Further, the switches S1 and S3 may be implemented by directly using a pin with a grounding function in the MCU.
As a further improvement of the present invention, the switch S1, the switch S2 and the switch S3 are BJT and JFET devices which are MOS devices.
As a further improvement of the present invention, the inductor L is connected to the resistor R5 and then connected to the code signal output terminal, and the resistor R5 is also grounded through the switch S3; the switch S1, the switch S2 and the switch S3 are MOS tubes.
As a further improvement of the present invention, one end of the inductor L is connected to the output end of the voltage conversion chip, the other end of the inductor L is connected to the resistor R2, the resistor R4, the capacitor C, and the resistor R5, the resistor R4 is connected to the S end of the switch S2, the D end of the switch S2 and the resistor R2 are connected to the FB end of the voltage conversion chip, the FB end of the voltage conversion chip is further connected to the resistor R1 and the resistor R3, the resistor R3 is connected to the D end of the switch S1, the resistor R5 is connected to the code signal output end and the D end of the switch S3, and the S end of the switch S1 and the S end of the switch S3 are connected to the other end of the capacitor C;
the G terminal of the switch S1, the G terminal of the switch S2 and the G terminal of the switch S3 are connected with the control module.
As a further improvement of the present invention, one end of the inductor L is connected to the output end of the voltage conversion chip, the other end of the inductor L is connected to the series circuit of the resistor R4 and the resistor R2, the capacitor C and the resistor R5, and both ends of the resistor R4 are connected to the S terminal of the switch S2 and the D terminal of the switch S2, respectively;
the resistor R2 is connected with the FB end of the voltage conversion chip, the FB end of the voltage conversion chip is further connected with a series circuit of a resistor R3 and a resistor R1, and two ends of the resistor R1 are respectively connected with the D end of the switch S1 and the S end of the switch S1; the resistor R5 is connected with the code printing signal output end and the D end of the switch S3, and the resistor R1, the capacitor C2 and the S end of the switch S3 are grounded;
the G terminal of the switch S1, the G terminal of the switch S2 and the G terminal of the switch S3 are connected with the control module.
The utility model also discloses an initiative pen, it includes as above arbitrary one the output voltage adjustable that is used for initiative pen beat sign indicating number circuit.
Compared with the prior art, the beneficial effects of the utility model are that:
the technical scheme of the utility model, through adjusting the resistance in the feedback loop of DCDC to produce different code printing voltages, the output voltage of the code printing circuit is adjustable, and the power consumption can be reduced as much as possible under the condition of ensuring normal writing; the power amplifier has better resistance to environmental noise, and solves the problems that the power consumption cannot be minimized and the signal-to-noise ratio cannot be improved according to the use environment due to the fact that the output voltage is not adjustable in the traditional scheme.
In addition, the technical scheme of the utility model can also solve the problem that the synchronization requirement of the control signal in the existing coding circuit is strict; the problems that the rising edge of a code printing signal in the correlation technique has a large peak, the adjustment of the code printing signal is difficult to control and the amplitude is limited are solved, and the signal amplitude can be automatically or manually adjusted according to different use environments.
Drawings
Fig. 1 is a circuit block diagram of the active pen of the present invention.
Fig. 2 is a circuit diagram of the coding circuit according to embodiment 1 of the present invention.
Fig. 3 is a circuit diagram of a coding circuit according to embodiment 2 of the present invention.
Fig. 4 is a circuit diagram of a coding circuit according to embodiment 3 of the present invention.
Fig. 5 is a circuit diagram of a coding circuit according to embodiment 4 of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, an active pen includes a power module, a communication module, a control module, a coding circuit and an input module, where the power module, the communication module, the input module and the coding circuit are respectively connected to the control module; the power module comprises a battery and a DCDC chip, and the control module comprises an MCU chip. The input module is a key. Wherein, the DCDC chip can adopt SGM6601, and the MCU chip can adopt MSP430FR 2433. The battery may be a dry cell battery or a rechargeable battery.
As shown in FIG. 2, the coding circuit includes an inductor L, a capacitor C, a switch S1, a switch S2, a switch S3, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, one end of the inductor L is connected with the output end of the DCDC chip, the other end of the inductor L is connected with one end of the resistor R2, one end of the resistor R4, one end of the capacitor C and one end of the switch S3, the other end of the switch S3 is connected with the code signal output end and one end of the resistor R5, the other end of the resistor R4 is connected with one end of the switch S2, the other end of the resistor R2 and the other end of the switch S2 are connected with the FB end of the DCDC chip, the FB terminal of the DCDC chip is also connected with one end of a resistor R1 and one end of a resistor R3, the other end of the resistor R3 is connected with one end of the switch S1, and the other end of the resistor R1, the other end of the switch S1, the other end of the resistor R3 and the other end of the capacitor C are grounded.
By adopting the technical scheme, for example, 16V is taken as the minimum voltage value of the DCDC output, and then 1-3V is taken as the voltage difference between two adjacent stages, and the resistance values of R1-R4 are designed, so that different voltage values are generated. Assuming that the voltage VFB of the FB pin of the DCDC chip is fixed at 1V, R1 is 10k Ω, R2 is 165k Ω, R3 is 40k Ω, and R4 is 1.65M Ω, the voltage values shown in the following table can be generated.
| On-off state | S1 is closed | S1 open circuit |
| S2 is closed | 19.75V | 16V |
| S2 open circuit | 21.625V | 17.5V |
With 16V as the first voltage level, 17.5V as the second voltage level, 19.75V as the third voltage level, and 21.625V as the fourth voltage level. In actual design, because the main application objects of different pens are different, a designer needs to design the upper limit and the lower limit of the coding voltage, the voltage difference between each level and the number of the voltage levels by himself. The design needs to pay attention to the fact that the inductor L and the capacitor C are designed according to the highest voltage of the output, and otherwise circuit failure can be caused. This example is for illustration only and does not make a specific circuit design.
After the active pen is started, the communication module receives a forced debugging signal, the voltage level of the coding signal can be controlled by the MCU to be gradually improved from low to high until the coding signal can be normally written, so that the output voltage can be adjusted according to the requirements of different touch screens on the coding voltage and the noise signals with different sizes introduced into the use environment, normal writing is guaranteed, and the power consumption can be reduced as much as possible.
Example 2
In addition to embodiment 1, as shown in fig. 3, in this embodiment, a resistor R3 and a resistor R4 are connected in series in a circuit, specifically, one end of the inductor L is connected to an output end of the DCDC chip, the other end of the inductor L is connected to a series circuit of a resistor R4 and a resistor R2, a capacitor C and a switch S3, two ends of the resistor R4 are connected in parallel to the switch S2, the resistor R2 is connected to an FB end of the DCDC chip, the FB end of the DCDC chip is further connected in series with the resistor R3 and the resistor R1 and then grounded, two ends of the resistor R1 are connected in parallel to the switch S1; the capacitor C is grounded; the switch S3 is connected with the code signal output end, and the switch S3 is also grounded through a resistor R5.
Example 3
In addition to embodiment 1, as shown in fig. 4, the switches S1, S2, and S3 are MOS transistors. One end of the inductor L is connected with an output end of the DCDC chip, the other end of the inductor L is connected with a resistor R2, a resistor R4, a capacitor C and a resistor R5, the resistor R4 is connected with an S end of a switch S2, a D end of a switch S2 and a resistor R2 are connected with an FB end of the DCDC chip, the FB end of the DCDC chip is further connected with a resistor R1 and a resistor R3, the resistor R3 is connected with a D end of the switch S1, a resistor R5 is connected with a code signal output end and a D end of the switch S3, and an S end of a switch S1 and an S end of the switch S3 are connected with the other end of the capacitor C; the G end of the switch S1, the G end of the switch S2 and the G end of the switch S3 are connected with three IO ends of the MCU, and whether the MOS tube is conducted or not is controlled through the voltage of the control grid electrode.
Example 4
Based on embodiment 3, as shown in fig. 5, one end of the inductor L is connected to the output end of the DCDC chip, the other end of the inductor L is connected to the resistor R4, the series circuit of the resistor R2, the capacitor C, and the resistor R5, and both ends of the resistor R4 are connected to the S terminal of the switch S2 and the D terminal of the switch S2, respectively;
the resistor R2 is connected with the FB end of the DCDC chip, the FB end of the DCDC chip is further connected with a series circuit of a resistor R3 and a resistor R1, and two ends of the resistor R1 are respectively connected with the D end of the switch S1 and the S end of the switch S1; the resistor R5 is connected with the code printing signal output end and the D end of the switch S3, and the resistor R1, the capacitor C2 and the S end of the switch S3 are grounded; the G end of the switch S1, the G end of the switch S2 and the G end of the switch S3 are connected with three IO ends of the MCU.
The above-mentioned embodiments are the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-mentioned embodiments, and the scope of the present invention includes and is not limited to the above-mentioned embodiments, and all equivalent changes made according to the shape and structure of the present invention are within the protection scope of the present invention.
Claims (7)
1. The utility model provides an output voltage adjustable beats sign indicating number circuit for initiative pen which characterized in that: the active pen comprises a power module, a communication module, a control module, a code printing circuit and an input module, wherein the power module, the communication module, the input module and the code printing circuit are respectively connected with the control module, and the power module comprises a battery and a voltage conversion chip;
the coding circuit comprises an inductor L, a capacitor C, a switch S1, a switch S2, a switch S3, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the output end of the voltage conversion chip is connected with an LC resonance circuit formed by serially connecting the inductor L and the capacitor C, a serial circuit of the resistor R2 and the resistor R1 is connected with two ends of the capacitor C in parallel, and the connection point of the resistor R2 and the resistor R1 is connected with the FB end of the voltage conversion chip;
a resistor R3 and a resistor R4 are respectively connected in parallel or in series beside the resistors R1 and R2, and whether the resistors are connected into the circuit is respectively controlled through a switch S1 and a switch S2; the switch S1 and the switch S2 are electrically connected with the control module.
2. The adjustable coding circuit of output voltage for an active pen of claim 1, wherein: the inductor L is connected with the coding signal output end after being connected with the switch S3, and the switch S3 is grounded through a resistor R5.
3. The adjustable coding circuit that is used for output voltage of initiative pen of claim 2 characterized by that: the switch S1, the switch S2 and the switch S3 are BJT and JFET devices which are MOS devices.
4. The adjustable coding circuit of output voltage for an active pen of claim 1, wherein: the inductor L is connected with the coding signal output end after being connected with the resistor R5, and the resistor R5 is grounded through a switch S3; the switch S1, the switch S2 and the switch S3 are MOS tubes.
5. The adjustable coding circuit of output voltage for an active pen of claim 4, wherein: one end of the inductor L is connected with an output end of the voltage conversion chip, the other end of the inductor L is connected with a resistor R2, a resistor R4, a capacitor C and a resistor R5, the resistor R4 is connected with an S end of a switch S2, a D end of a switch S2 and a resistor R2 are connected with an FB end of the voltage conversion chip, the FB end of the voltage conversion chip is further connected with a resistor R1 and a resistor R3, the resistor R3 is connected with a D end of the switch S1, a resistor R5 is connected with a code signal output end and a D end of the switch S3, and an S end of a switch S1 and an S end of the switch S3 are connected with the other end of the capacitor C;
the G terminal of the switch S1, the G terminal of the switch S2 and the G terminal of the switch S3 are connected with the control module.
6. The adjustable coding circuit of output voltage for an active pen of claim 4, wherein: one end of the inductor L is connected with the output end of the voltage conversion chip, the other end of the inductor L is connected with the resistor R4, the series circuit of the resistor R2, the capacitor C and the resistor R5, and two ends of the resistor R4 are respectively connected with the S end of the switch S2 and the D end of the switch S2;
the resistor R2 is connected with the FB end of the voltage conversion chip, the FB end of the voltage conversion chip is further connected with a series circuit of a resistor R3 and a resistor R1, and two ends of the resistor R1 are respectively connected with the D end of the switch S1 and the S end of the switch S1; the resistor R5 is connected with the code printing signal output end and the D end of the switch S3, and the resistor R1, the capacitor C2 and the S end of the switch S3 are grounded;
the G terminal of the switch S1, the G terminal of the switch S2 and the G terminal of the switch S3 are connected with the control module.
7. An active pen, comprising: the coding circuit comprises the coding circuit with the adjustable output voltage for the active pen as claimed in any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922220384.9U CN210807073U (en) | 2019-12-11 | 2019-12-11 | Output voltage adjustable coding circuit for active pen and active pen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922220384.9U CN210807073U (en) | 2019-12-11 | 2019-12-11 | Output voltage adjustable coding circuit for active pen and active pen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210807073U true CN210807073U (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922220384.9U Active CN210807073U (en) | 2019-12-11 | 2019-12-11 | Output voltage adjustable coding circuit for active pen and active pen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210807073U (en) |
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- 2019-12-11 CN CN201922220384.9U patent/CN210807073U/en active Active
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