CN215897699U

CN215897699U - Multifunctional switch system

Info

Publication number: CN215897699U
Application number: CN202120991040.2U
Authority: CN
Inventors: 李敏; 宋海彬
Original assignee: Shanghai Reacheng Communication Technology Co ltd
Current assignee: Shanghai Reacheng Communication Technology Co ltd
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2022-02-22
Anticipated expiration: 2031-05-11

Abstract

The utility model discloses a multifunctional switch system, namely a switch system for realizing multiple functions based on a single touch switch, which realizes the touch of the single touch switch and can control the control of multiple functions. The system aims to enhance the stability and the practicability of the switch system. By utilizing the induction capacitance existing between any two conductive objects, when a finger approaches a touch key, the induction capacitance formed by the finger and the ground, which is connected in parallel with a pad, and the induction capacitance formed by the ground, the total induction capacitance value is increased; and after detecting that the value of the induction capacitor is changed, the touch IC outputs a signal that the key is pressed down to the central processing unit or the MCU, so that the multi-function control is realized. Compared with the traditional mechanical switch system, the switch has the advantages of attractive appearance, durability, low manufacturing cost, good sealing performance and the like. The intelligent terminal is widely applied to wireless earphones, wall switches, smart homes, electronic doorbells, industrial controls, robots, household appliances, sports bracelets and the like.

Description

Multifunctional switch system

Technical Field

The utility model relates to the field of large intelligent terminals, in particular to a multifunctional switch system.

Background

The conventional switch system generally comprises a plurality of mechanical switches, and the on or off of the circuit is controlled by adopting a mechanical contact mode. On one hand, the space is large and is not small enough; on the other hand, the switch is worn after a long time, the arc extinguishing capability of the contact is poor, the service life is reduced, and the switch is damaged. The utility model has the advantages of beautiful appearance, low cost, simple structure, durability, good sealing performance, easy installation and the like.

A multifunctional switch system features that an inductive capacitor is arranged between any two electrically conductive objects, and a key, i.e. a pad, and earth can form an inductive capacitor whose value is a fixed and unchangeable small value. When a human finger is close to the touch key, the total induction capacitance value is increased by the induction capacitance formed by the induction capacitance parallel connection pad formed by the human finger and the ground and the induction capacitance formed by the ground. After detecting that the induction capacitance value of a certain key is changed, the capacitance type touch IC outputs 2 different control signals to the CPU or the MCU, thereby achieving the aim of controlling multiple functions by a single key. For example, long press 3S control on/off is realized; long press 8s reset and short press dormancy; and simultaneously enabling the system to enter an OQC engineering detection mode according to 5 s. (the function can be realized only by simultaneously triggering the powerkey and the GPIO, belonging to the function of platform limitation)

The system aims to enhance the stability and the practicability of the switch system. As a novel human-computer interaction interface, the intelligent mobile phone is widely applied to products such as wireless earphones, wall switches, smart homes, electronic doorbells, robots, household appliances, smart watches, sports bracelets, toys, door locks, POS machines and the like, and an inevitable trend is formed in various intelligent terminals.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a multi-functional switch system to solve the above-mentioned problems of the prior art.

In order to achieve the purpose, the utility model provides the following technical scheme:

a multi-function switching system, characterized by: the touch PAD circuit comprises a touch PAD, a touch IC circuit, a first unidirectional level conversion circuit and a second unidirectional level conversion circuit; the touch PAD is connected with the touch IC, the touch IC receives the touch signal, processes the touch signal and sends a digital touch signal, and the digital touch signal and the key GPIO signal are respectively transmitted to the CPU or the MCU after high-low level conversion is carried out by the first unidirectional level conversion circuit and the second unidirectional level conversion circuit.

As a further scheme of the utility model: the touch PAD is square or circle center in the conventional way, and is generally made of PCB copper foil, metal sheets, conductive cotton and the like. Area size of touch PAD: minimum 4mm by 4mm, maximum 30mm by 30 mm. The actual area size depends on the desired sensitivity and is proportional to the sensitivity.

As a further scheme of the utility model: the touch IC circuit is composed of a touch IC, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R2, a resistor R3, a resistor R4, and a resistor R11. The touch IC U1 and the battery VBAT supply power to the U1; the 6-pin OSEL of U1 is connected with high level VBAT, the 1-pin ST signal output of U1 is open-drain, the high level or low level of the control signal is output to a GPIO port of a central processing unit or MCU through a pull-up resistor R11, the 6-pin of U1 is connected to a touch PAD through a filter circuit formed by a resistor R3 and a capacitor C3, and the 4-pin of U1 is connected with a ground resistor R2, so that the key sensitivity can be simply adjusted.

As a further scheme of the utility model: the first unidirectional level conversion circuit is composed of a resistor R6, a resistor R5, a resistor R1, a resistor R7 and an NPN triode Q1; one end of the long-press switch is connected with an output ST pin of the U1, and the other end of the long-press switch is connected with a POWERKEY pin of the central processing unit or the MCU, so that the long-press switch is controlled by 3S, and the long-press switch is reset by 8S and the short-press switch is dormant.

As a further scheme of the utility model: the second unidirectional level conversion circuit is composed of a resistor R9, a resistor R8, a resistor R10 and an NPN triode Q3. One end of the output signal is connected with an ST pin of the U1, the other end of the output signal is connected with a GPIO pin of a central processing unit or an MCU, and the system is enabled to enter an OQC engineering detection mode according to 5 s. (this function must need power key and GPIO to trigger at the same time to realize, belong to the function that the platform limits);

the method comprises the steps that an induction capacitor exists between any two conductive objects, one touch key, namely one touch PAD and the ground form the induction capacitor, and when a human finger approaches the touch key, the induction capacitor formed by the human finger and the ground is connected with the induction capacitor formed by a PAD and the ground in parallel, so that the total induction capacitor value is increased; after detecting that the value of the induction capacitor of a certain key is changed, the capacitance type touch IC outputs a determination signal that the certain key is pressed to a CPU or an MCU, so that the multi-function control is realized.

Compared with the prior system, the utility model has the beneficial effects that: the multifunctional switch system has the advantages that one capacitive touch key can realize control of multiple functions simultaneously, the cost is reduced, the multifunctional switch system is durable, the appearance is sealed, the stability is high, and the multifunctional switch system is essentially different from the traditional mechanical key; meanwhile, more safety guarantee and convenience are brought to the use of the terminal user, and the user is practiced.

Drawings

Fig. 1 is a circuit diagram of a multi-function switching system.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, in an embodiment of the present invention, a multifunctional switch system is characterized in that: the touch PAD circuit comprises a touch PAD, a touch IC circuit, a first unidirectional level conversion circuit and a second unidirectional level conversion circuit; the touch PAD is connected with the touch IC, the touch IC receives the touch signal, processes the touch signal and sends a digital touch signal, and the digital touch signal and the touch PAD give signals to a Powerkey and a key KCOL1 of the platform after high and low level conversion is respectively carried out through the first unidirectional level conversion circuit and the second unidirectional level conversion circuit.

The touch PAD is square or circle center in the conventional way, and is generally made of PCB copper foil, metal sheets, conductive cotton and the like. The area of the key induction plate is as follows: minimum 4mm by 4mm, maximum 30mm by 30 mm. The actual area is determined according to the requirement of sensitivity, and the area is in direct proportion to the sensitivity; no matter what material is used, the key induction plate must be closely attached to the panel, and no air gap can be left in the middle; when the flat-top cylindrical spring is used, the diameter of the PCB at the joint of the touch line and the spring is slightly larger than that of the spring, so that the spring is ensured not to contact the floor even if the spring is compressed on the PCB.

The touch IC circuit is composed of a touch IC, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R2, a resistor R3, a resistor R4, and a resistor R11. The touch IC U1 and the battery VBAT supply power to the U1; the 6-pin OSEL of U1 is connected with high level VBAT, the 1-pin ST signal output of U1 is open-drain, the high level or low level of the control signal is output to a GPIO port of a central processing unit or MCU through a pull-up resistor R11, the 6-pin of U1 is connected to a touch PAD through a filter circuit formed by a resistor R3 and a capacitor C3, and the 4-pin of U1 is connected with a ground resistor R2, so that the key sensitivity can be simply adjusted.

The first unidirectional level conversion circuit is composed of a resistor R6, a resistor R5, a resistor R1, a resistor R7 and an NPN triode Q1. One end of the long-press switch is connected with an output ST pin of the U1, and the other end of the long-press switch is connected with a Powerkey pin of the CPU or the MCU, so that the long-press switch is controlled to be on and off by 3S, and the long-press switch is reset by 8S and the short-press switch is dormant.

The second unidirectional level conversion circuit consists of a resistor R9, a resistor R8, a resistor R10 and an NPN triode Q3; one end of the output ST pin of the U1 is connected, the other end of the output ST pin is connected with the GPIO pin of the CPU or the MCU, and the system enters an OQC engineering detection mode (the function can be realized only by triggering at the same time and belongs to the function of platform limitation) according to 5s at the same time.

The power supply module is provided by a battery VBAT of the terminal equipment.

The system utilizes the induction capacitance existing between any two conductive objects, one touch key, namely one touch PAD and the ground form the induction capacitance, when a human finger is close to the touch key, the induction capacitance formed by the human finger and the ground in parallel connection with a PAD and the induction capacitance formed by the ground can increase the total induction capacitance value; after detecting that the value of the induction capacitor of a certain key is changed, the capacitance touch IC outputs a determination signal that the certain key is pressed to the central processing unit or the MCU, so that the multi-function control is realized.

Compared with the prior system, the utility model has the beneficial effects that: the multifunctional switch system has the advantages that the capacitive touch type key can realize control of multiple functions simultaneously, the relative cost is reduced, the durability is realized, the appearance sealing and the stability are both superior, and the multifunctional switch system is essentially different from the traditional mechanical type key. Meanwhile, more safety guarantee and convenience are brought to the use of the terminal user, and the user is practiced.

It will be evident to those skilled in the art that the utility model 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 attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model 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 description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A multi-function switching system, characterized by: the touch PAD circuit comprises a touch PAD, a touch IC circuit, a first unidirectional level conversion circuit and a second unidirectional level conversion circuit; the touch PAD is connected with the touch IC, the touch IC receives the touch signal, processes the touch signal and sends a digital touch signal, and the digital touch signal and the key GPIO signal are respectively transmitted to the CPU or the MCU after high-low level conversion is carried out by the first unidirectional level conversion circuit and the second unidirectional level conversion circuit.

2. A multi-function switch system as claimed in claim 1, wherein: the touch PAD adopts a round copper sheet, the actual area is determined by the requirement of sensitivity, and the larger the area is, the larger the sensitivity is.

3. A multi-function switch system as claimed in claim 2, wherein: the touch IC circuit is composed of a touch IC, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R2, a resistor R3, a resistor R4 and a resistor R11; the touch IC U1 and the battery VBAT supply power to the U1; the 6-pin OSEL signal of U1 is connected with high level VBAT, the 1-pin ST signal of U1 is open-drain, the high level or low level of the control signal is output to a central processing unit or a GPIO port of an MCU through a pull-up resistor R11, the 6-pin of U1 is connected to a touch PAD through a filter circuit formed by a resistor R3 and a capacitor C3, and the 4-pin of U1 is connected to a ground resistor R2, so that the key sensitivity can be simply adjusted.

4. A multi-function switch system as claimed in claim 3, wherein: the first unidirectional level conversion circuit is composed of a resistor R6, a resistor R5, a resistor R1, a resistor R7 and an NPN triode Q1; one end of the long-press switch is connected with an output ST pin of the U1, and the other end of the long-press switch is connected with a Powerkey pin of the central processing unit or the MCU, so that the long-press switch can be controlled by 3S, and the long-press switch can be reset by 8S and can be in sleep state by short-press.

5. A multi-function switch system as claimed in claim 4, wherein: the second unidirectional level conversion circuit consists of a resistor R9, a resistor R8, a resistor R10 and an NPN triode Q3; one end of the output ST pin of the U1 is connected, the other end of the output ST pin is connected with the GPIO pin of the central processing unit or the MCU, and pins Powerkey and GPIO 5s are triggered simultaneously to enable the system to enter an OQC engineering detection mode.