Active pen, step-up circuit and control method

Abstract

The invention proposes an active pen, a step-up circuit and a control method thereof. A boost circuit (10) comprises an inductor (1), a switch module, a capacitor (3) and a control module (4); the switch module at least comprises a first switch (21) and a second switch (22), a first end of the first switch is connected to one end of the inductor and a second end of the second switch is connected in parallel with the second switch; is connected to a first end of the second switch (22), and a second end of the second switch (22) is grounded; the other end of the inductor (1) is used for connecting to a power supply; the control module 4) is connected to the control terminal of the switch module; the control module (4) is used to control the state of each switch in the switch module so that the first end of the second switch (22) outputs a preset frequency And the amplitude of the voltage signal. The control method can improve the signal-to-noise ratio of the communication signal by using the frequency hopping communication technology, and meanwhile can reduce the system power consumption by adjusting the code voltage amplitude according to the application scenario.

Description

technical field [0001] The present application relates to the technical field of booster circuits, in particular to an active pen, a booster circuit and a control method thereof. Background technique [0002] At present, more and more terminal devices have touch screens, and the active pen 101 can be used to write or input instructions to terminal devices 104 with touch screens, such as computer screens, mobile terminal devices, drawing tablets, etc., to realize human-computer interaction, such as figure 1 shown. [0003] The nib 103 at the end of the nib 102 of the active pen 101 outputs a coding signal to realize the communication between the active pen 101 and the terminal device 104 with a touch screen. The signal-to-noise ratio of communication signals between the terminal devices 104 of the touch screen. [0004] In the process of implementing this application, the inventor found that there are at least the following problems in the prior art: the current solution fo...

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Problems solved by technology

[0004] In the process of implementing this application, the inventor found that there are at least the following problems in the prior art: the current solution for pen tip 103 to realize high-voltage coding is mainly LC resonance coding. In the LC resonance circuit, the inductor and capacitor form a series resonance circuit. The power supply in the pen 101 provides energy input for the LC resonant circuit, and the LC resonant circuit outputs a high-voltage coding signal to the pen tip; however, in the LC resonant circuit, after the inductance and capacitance are selected, the circuit output high-voltage frequency is fixed and cannot be adjusted, so that The signal-to-noise ratio of the circuit is fixed and cannot be improved; at the same time, the output high voltage range of the circuit is also fixed and cannot be adjusted, which cannot reduce system power consumption

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