WO2013053106A1

WO2013053106A1 - Method and system for outputting key pressing signal

Info

Publication number: WO2013053106A1
Application number: PCT/CN2011/080662
Authority: WO
Inventors: 王琪
Original assignee: 中联重科股份有限公司; 湖南中联重科专用车有限责任公司
Priority date: 2011-10-11
Filing date: 2011-10-11
Publication date: 2013-04-18

Abstract

The present invention provides a method and a system for outputting a key pressing signal, so as to solve the problem in the prior art that the key pressing signal processing does not apply to complex environments and has low precision. The method comprises: an oscillator simultaneously inputting the same oscillation signals to two input ends of a comparator; one of the two input ends of the comparator further receiving an external interference signal that is used as a key pressing operation; the comparator comparing the signals received at the two input ends, and outputting a signal obtained after comparison. The technical solution of the present invention facilitates triggering of the key pressing in a complex environment and improving of the precision of key pressing signal outputting.

Description

FIELD OF THE INVENTION The invention relates to a method and system for outputting a button signal. BACKGROUND OF THE INVENTION At present, the keys used are classified into mechanical buttons, capacitive touch buttons, and inductive touch buttons. Among them: mechanical buttons, the principle is simple, the production process requirements are low, and the price is relatively cheap; the basic principle of the capacitive touch sensor button is a constant charge and discharge relaxation oscillator. If the switch is not touched, the relaxation oscillator has a Fixed charging and discharging cycle, the frequency can be measured. If the switch is touched by hand or touch pen, the dielectric constant of the capacitor will increase, the charging and discharging cycle will become longer, the frequency will decrease, and the system will judge that a touch is generated. The basic principle of the inductive touch-sensitive button is that when the hand is pressed to the panel, the panel will produce tens of micrometers of bending, which will move the panel to the coil formed by the etching on the underlying circuit board, and the coil inductance on the printed circuit board. The sensor detects a small change in the magnetic flux between the panel bending and the PCB, which in turn causes a small change in the current in the coil, and the system determines that a touch has occurred. Among the existing buttons used, the mechanical life of mechanical button design is 50,000 times in China and 100,000 times in imports, but the actual use is not ideal. Capacitive touch buttons are the most widely used at present, and have complete chips. However, due to its high requirements on external circuits such as power supplies, the main products used are personal electronic products, which are rarely used in complex environments. Capacitive buttons are prone to malfunction due to the capacitive effect of the human body; inductive touch The complexity of the mechanical design is relatively high due to the need of the interface device. In the prior art, the processing of the button signal has a problem that it is not suitable for a complicated environment and has a low accuracy. For this problem, an effective solution has not been proposed yet. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a method and system for outputting a button signal to solve the problem that the processing of a button signal in the prior art is unsuitable for a complicated environment and has a low accuracy. In order to solve the above problems, according to an aspect of the present invention, a method of outputting a key signal is provided. The method for outputting a button signal of the present invention includes: an oscillator simultaneously inputs the same oscillating signal to two inputs of the comparator; and one of the two inputs of the comparator further receives an external Interference signal as a button operation; the comparator compares signals received by the two inputs, and outputs ratio The signal obtained later. According to another aspect of the present invention, a system for outputting a key signal is provided. The system for outputting a key signal of the present invention includes a conductor, an oscillator and a comparator, wherein: the conductor is connected to one of two inputs of the comparator; the output of the oscillator The two inputs of the comparator are connected; the output of the comparator acts as an output of the system. According to yet another aspect of the present invention, yet another system for outputting a button signal is provided. The system for outputting a key signal of the present invention includes an electrical conductor, an oscillator, a comparator, and an optimizer, wherein: the electrical conductor is coupled to one of two inputs of the comparator; the oscillator An output of the comparator is coupled to the two inputs of the comparator; an output of the comparator is coupled to an input of the optimizer; an output of the optimizer is an output of the system. According to yet another aspect of the present invention, yet another system for outputting a button signal is provided. The system for outputting a key signal of the present invention includes an electrical conductor, an oscillator, a comparator, an optimizer, an inverter, and an isolator, wherein: the electrical conductor is input to one of two inputs of the comparator An output of the oscillator is coupled to the two inputs of the comparator; an output of the comparator is coupled to an input of the optimizer; an output of the optimizer is An input of the inverter is coupled; an output of the inverter is coupled to an input of the isolator; an output of the isolator is an output of the system. According to the technical solution of the present invention, the same oscillating signal is simultaneously input from the oscillator to the two input ends of the comparator, and the external key operation signal enters the comparator in a manner of interfering signals, so that the comparator can be input according to two inputs. The difference is to output the signal as the button signal, because the interference signal caused by the touch of the human finger can be collected by using a simple conductive object such as a metal piece, so the technical solution of the embodiment is simple and practical, and is helpful for implementing the button in a complicated environment. Trigger. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are intended to provide a further understanding of the invention In the drawings: FIG. 1 is a flow chart showing main steps of a method for outputting a key signal according to an embodiment of the present invention; FIG. 2 is a schematic diagram showing a basic structure of an optimizer in a method for outputting a key signal according to an embodiment of the present invention; Is a connection diagram of a comparator in a method of outputting a button signal according to an embodiment of the present invention; 4 is a schematic diagram showing the basic structure of an isolator in a method of outputting a key signal according to an embodiment of the present invention; FIG. 5 is a schematic diagram showing a main part of a system for outputting a key signal according to an embodiment of the present invention; A schematic diagram of a main component of a second system for outputting a key signal according to an embodiment of the present invention; and FIG. 7 is a schematic diagram of a main component of a third system for outputting a key signal according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. 1 is a flow chart showing the main steps of a method for outputting a button signal according to an embodiment of the present invention. As shown in FIG. 1, the method mainly includes the following steps: Step S11: Simultaneous input of the oscillator to two inputs of the comparator The same oscillating signal; Step S13: one of the two inputs of the comparator further receives an interference signal from the external as a button operation; Step S15: The comparator performs the signal received by the two inputs of the comparator Compare, output the resulting signal after comparison. It can be seen from the above steps that the same oscillating signal is simultaneously input from the oscillator to the two input terminals of the comparator, and the external key operation signal enters the comparator one way in the manner of the interference signal, so that the comparator can be based on two inputs. The difference is to output the signal as the button signal, because the interference signal caused by the touch of the human finger can be collected by using a simple conductive object such as a metal piece, so the technical solution of the embodiment is simple and practical, and is helpful for implementing the button in a complicated environment. Trigger. Preferably, after step S15, the signal obtained by comparing the comparators by the optimizer is subjected to waveform optimization processing and output. The function of the optimizer is to simply organize and filter the signal, enhance the anti-interference ability of the circuit, and the structure shown in FIG. 2 can be adopted. FIG. 2 is a basic diagram of the optimizer in the method for outputting the key signal according to the embodiment of the present invention. Schematic. As shown in FIG. 2, the optimizer in this embodiment includes a first capacitor 21, a second capacitor 23, and a first diode. 22. The second diode 24 and the resistor 25, wherein: the first end of the first capacitor 21 is used as an input end of the optimizer to input a comparison signal, and the second end is connected to the first diode 22 and the second diode 24 The cathode of the first two poles 22 is connected to the first end of the second capacitor 23 and the first end of the resistor 25, and the connection point is used as the output end of the optimizer; the second diode 24 is positive, and the second capacitor 23 is second. The second end of the resistor 25 is grounded. For the signal output by the optimizer, it can be used as a button signal. Preferably, the signal output by the optimizer can be further processed and then used as a button signal. For example, the inverter outputs the signal output by the optimizer for inversion processing. Then, it is sent to the isolator, and the isolator outputs the isolated processing signal according to the received signal, and uses the signal after the isolation processing as a key signal to further enhance the anti-interference ability of the circuit. 3 is a schematic diagram of a connection of a comparator in a method of outputting a key signal according to an embodiment of the present invention. As shown in FIG. 3, a human finger contacts the conductive material 31 to generate an interference signal, and after entering the capacitor, enters an input terminal of the comparator 34. The oscillating signal is injected from 32, divided into two paths and then enters the two inputs of the comparator 34, and the compared signal is output from the output 33 of the comparator 34. The conductive member 31 may be a metal piece or a conductor of other shapes. 4 is a schematic diagram showing the basic structure of an isolator in a method for outputting a key signal according to an embodiment of the present invention, where 41 is an input end of the isolator, and in this embodiment, the output of the comparator is received by the inverter, or The receiver receives the signal from the optimizer-optimized comparator output, and then receives the signal from the inverter output from the input terminal 41 of the isolator, 42 is the output of the isolator, and is used as a button signal. In this embodiment, when the conductive material 31 does not pass through other conductive medium or is not directly in contact with the human body, since the signals of the two input terminals of the signal comparator are the same, the signal of the output terminal 33 of the comparator 34 is always low. This causes the input of the inverter to be low, the output of the inverter is also tied high, and there is no change at the output of the button signal 42. It can be considered that no button signal is generated; the button passes through other conductive media or directly When the human body is in contact, since one input terminal of the comparator is interfered, the two input signals do not match, so the signal at the output terminal 33 changes to a high level, so that the output end of the inverter signal is pinned at a low level. As a result, the current of the button signal output terminal 42 is also pulled low, and it is considered that a button signal is generated. 5 is a schematic diagram of the main components of a first system for outputting a key signal in accordance with an embodiment of the present invention. As shown in FIG. 5, the system 50 for outputting a key signal includes a conductive material 51, an oscillator 52, and a comparator 53. The conductor 51 is connected to an input 54 of the comparator 53; the output of the oscillator 52 is connected to the two inputs 53, 54 of the comparator 53; the output of the comparator 53 serves as the output of the system for outputting the button signal. The connections in the figures are only schematic, and the related elements such as resistors and the like are omitted in the drawings, and can be referred to the previous figures, the same below. 6 is a schematic diagram of the main components of a second system for outputting a button signal in accordance with an embodiment of the present invention. As shown in FIG. 6, the second system 60 for outputting a button signal according to an embodiment of the present invention includes a conductive object 61 and a vibration. The hopper 62, the comparator 63 and the optimizer 66, wherein: the conductor 61 is connected to an input 65 of the comparator 63; the output of the oscillator 62 is connected to the two inputs 64, 65 of the comparator 63; The output of 63 is coupled to the input of optimizer 66; the output of optimizer 66 serves as the output of the system for outputting the key signal. An alternative structure of the optimizer 66 is shown in FIG. 7 is a schematic diagram of the main components of a third system for outputting a button signal in accordance with an embodiment of the present invention. As shown in FIG. 7, the system 70 for outputting a button signal includes a conductor 71, an oscillator 72, a comparator 73, an optimizer 76, an inverter 77, and an isolator 78, wherein: an input of the conductor 71 and the comparator 73 The terminal 75 is connected; the output of the oscillator 72 is connected to the two inputs 74, 75 of the comparator 73; the output of the comparator 73 is connected to the input of the optimizer 76; the output of the optimizer 76 is connected to the inverter 77. The input of the inverter is connected to the input of the isolator 78; the output of the isolator 78 serves as the output of the system for outputting the key signal. An alternative configuration of optimizer 76 is shown in FIG. The isolator 78 can employ an opto-isolator. According to the technical solution of the present invention, the same oscillating signal is simultaneously input from the oscillator to the two input ends of the comparator, and the external key operation signal enters the comparator in a manner of interfering signals, so that the comparator can be input according to two inputs. The difference is to output the signal as the button signal, because the interference signal caused by the touch of the human finger can be collected by using a simple conductive object such as a metal piece, so the technical solution of the embodiment is simple and practical, and is helpful for implementing the button in a complicated environment. Trigger. Moreover, the device, such as an optimizer and an isolator, is used in the invention, which further enhances the anti-interference ability of the system. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A method of outputting a button signal, comprising:

The oscillator simultaneously inputs the same oscillating signal to the two inputs of the comparator;

One of the two inputs of the comparator also receives an interference signal from the outside as a button operation;

The comparator compares the signals received by the two inputs and outputs a signal obtained after comparison.

The method according to claim 1, wherein after the outputting the compared signal, the method further comprises: the optimizer performing waveform optimization processing on the compared signal and outputting .

3. The method according to claim 2, wherein the optimizer comprises a first capacitor, a second capacitor, a first diode, a second diode, and a resistor, wherein:

a first end of the first capacitor is used as an input end of the optimizer, and a second end is connected to a positive pole of the first diode and a cathode of the second diode;

a cathode of the first diode is coupled to a first end of the second capacitor and a first end of the resistor, and a connection point serves as an output of the optimizer;

The positive terminal of the second diode, the second end of the second capacitor, and the second end of the resistor are both grounded.

The method according to claim 2, wherein after the optimizer performs waveform optimization processing on the compared signal and outputs the method, the method further includes: receiving, by the inverter, the optimizer output The signal is sent to the isolator after being inverted, and the isolator isolates the received signal and outputs the isolated signal.

5. A system for outputting a button signal, comprising: an electrical conductor, an oscillator, and a comparator, wherein: the electrical conductor is coupled to one of two input ends of the comparator; the oscillation An output of the comparator is coupled to both of the inputs of the comparator; an output of the comparator serves as an output of the system.

6. A system for outputting a button signal, comprising: a conductor, an oscillator, a comparator, and an optimizer, wherein: The conductive object is connected to one of the two input ends of the comparator;

An output of the oscillator is coupled to the two inputs of the comparator; an output of the comparator is coupled to an input of the optimizer;

The output of the optimizer acts as the output of the system.

7. The system of claim 6, wherein the optimizer comprises a first capacitor, a second capacitor, a first diode, a second diode, and a resistor, wherein:

The anode of the second diode, the second end of the second capacitor, and the second end of the resistor are both grounded.

8. A system for outputting a button signal, comprising: a conductor, an oscillator, a comparator, an optimizer, an inverter, and an isolator, wherein:

The electrical conductor is coupled to one of the two inputs of the comparator; the output of the oscillator is coupled to the two inputs of the comparator; the output of the comparator Connected to the input of the optimizer;

An output of the optimizer is coupled to an input of the inverter;

An output of the inverter is coupled to an input of the isolator;

The output of the isolator acts as the output of the system.

9. The system of claim 8, wherein the optimizer comprises a first capacitor, a second capacitor, a first diode, a second diode, and a resistor, wherein:

0. The system of claim 8 or 9, wherein the isolator is an opto-isolator