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Capacitance detection circuit, power supply device and optical touch device

A technology of capacitance detection and power supply, which is applied in the input/output process of electrical digital data processing, instruments, and data processing, etc., can solve problems such as leakage, and achieve the effect of improving use efficiency

Active Publication Date: 2017-10-03
PIXART IMAGING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the sensing capacitor C S being charged to a predetermined voltage V P After that, there may be a leakage phenomenon, making the sensing terminal T S The voltage of the comparator Com drops because of the sensing terminal T when there is no object approaching or touching S The voltage drops and misjudged that the object is approaching or touching

Method used

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  • Capacitance detection circuit, power supply device and optical touch device
  • Capacitance detection circuit, power supply device and optical touch device
  • Capacitance detection circuit, power supply device and optical touch device

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Embodiment Construction

[0037] figure 2 A circuit diagram of the capacitance detection circuit 200 according to an embodiment of the present invention is shown. like figure 2 As shown, the capacitance detection circuit 200 includes a voltage source Vu 1 , Vu 2 , switch SW 1 , SW 2 , the reference capacitor C b , Comparator Com 1 , and the voltage maintenance device 201 . switch SW 1 by the control signal CS 1 control while conducting, the voltage source Vu 1 to the sensing capacitance C S Charge the inductive terminal T S The induced voltage V S Charge to the first voltage V 1 . switch SW 2 by the control signal CS 1 When turned on, the voltage source Vu 2 to the reference capacitor C b charge while the reference terminal T b The reference voltage V b Charge to the second voltage V 2 . where switch SW 1 , SW 2 Via control signal CS 1 conduct together. while the induced voltage V S and the reference voltage V b is charged to the first voltage V 1 and the second voltage V...

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Abstract

The invention discloses a capacitance detection circuit, comprising: a first voltage source; a first switch, when the first switch is turned on, the first voltage source charges the sensing capacitor to the first voltage; a reference capacitor; a second A voltage source; a second switch, when the second switch is turned on, the second voltage source charges the reference capacitor to a second voltage, wherein the first switch and the second switch are turned on or off together by a control signal The first comparator outputs a first comparison result according to the voltage difference between the induced voltage on the sensing capacitor and the reference voltage on the reference capacitor and the voltage difference between the first voltage and the second voltage; and a voltage maintenance circuit , to maintain the reference voltage at the reference voltage.

Description

technical field [0001] The present invention relates to a capacitance detection circuit, a power supply device and an optical touch device, in particular to a capacitance detection circuit using a voltage maintenance circuit, a power supply device using the capacitance detection circuit, and a power supply using the same The optical touch device of the device. Background technique [0002] In modern technology, touch devices are widely used in electronic devices. For example, the main input method of a smart phone is to allow users to input commands through objects (such as fingers or a stylus) through a touch screen, and a touchpad of a notebook computer is also a touch device. There are various types of touch devices. Currently, a capacitive touch device is more commonly used. This type of capacitive touch device determines the touch action of an object by changing the capacitance value. [0003] figure 1 A circuit diagram of a capacitance detection circuit in the prior...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/044G06F3/042
Inventor 高宏鑫
Owner PIXART IMAGING INC
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