CN210014571U

CN210014571U - Gas utensil capacitanc touch button failure detection device

Info

Publication number: CN210014571U
Application number: CN201920840833.7U
Authority: CN
Inventors: 陈光杰
Original assignee: Shanghai Rinnai Co Ltd
Current assignee: Shanghai Rinnai Co Ltd
Priority date: 2019-06-05
Filing date: 2019-06-05
Publication date: 2020-02-04
Anticipated expiration: 2029-06-05

Abstract

The utility model discloses a gas appliance capacitance type touch button failure detection device, which comprises a capacitance type touch button, a processing module and a driving module; a detection circuit is arranged between the capacitive touch button and the processing module; when the circuit works, the processing module sends continuous pulse signals to the detection circuit and receives constant current signals fed back by the detection circuit; when the capacitive touch button fails, the constant current signal is distorted; when the distortion amplitude of the constant current signal reaches a preset value, the processing module sends a corresponding switch signal to the driving module; the driving module sends out fault warning according to the switching signal, simultaneously closes the gas appliance and controls each corresponding electric control valve of the gas appliance to be opened or closed. The utility model discloses can distinguish automatically whether capacitanc touch button became invalid in real time, can in time close the running state of gas utensil, eliminate the potential safety hazard of product.

Description

Gas utensil capacitanc touch button failure detection device

Technical Field

The utility model relates to a gas utensil safety device technical field, in particular to gas utensil capacitanc touch button failure detection device.

Background

With the progress of technology, buttons of capacitive touch technology have been widely used on operation interfaces of gas appliances (such as gas water heaters and gas cookers).

The capacitive touch button is generally made of four layers of composite glass, wherein the inner surface and the interlayer of the glass are respectively coated with a layer of ITO (nanometer indium tin oxide), the outermost layer is a thin silica glass protective layer, and the interlayer ITO coating is used as a working surface.

When a finger touches, the finger and the surface of the button form a coupling capacitance due to the action of the human body's electric field, and for high frequency currents, the capacitance is a direct conductor, so that the finger draws a small current from the contact point. It is the electrical signal generated by this lost current that is used by the capacitive touch button to replace the traditional button's role in the control circuitry.

However, in the existing gas appliance manufacturing technology, only the capacitive touch button is replaced with the original button, and the detection means for the fault of the capacitive touch button during the operation still completely depends on manual inspection, however, once the fault of the capacitive touch button occurs, the control of the gas appliance is lost, which may cause certain damage to the user, and the failed electronic equipment is easy to generate high temperature or sparks, which may seriously even cause fire.

Therefore, a detection means for detecting whether the capacitive touch button of the gas appliance is invalid or not is urgently needed, the defects of the prior art are overcome, and the potential safety hazard of the product is eliminated.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defect of prior art, the utility model provides a gas utensil capacitanc touch button detection device that loses efficacy, one of the purpose of realization can differentiate capacitanc touch button in real time automatically whether inefficacy, in case the fault condition, when sending warning information, can in time close the running state of gas utensil, eliminates the potential safety hazard of product.

In order to achieve the above object, the utility model discloses a gas utensil capacitanc touch button failure detection device, including capacitanc touch button, processing module and drive module.

A detection circuit is arranged between the capacitive touch button and the processing module;

the detection circuit comprises a detection capacitor, an NMOS tube and a detection resistor;

the grid electrode of the NMOS tube is connected with the processing module, the drain electrode of the NMOS tube is grounded, and the source electrode of the NMOS tube is connected with the detection capacitor;

the other end of the detection capacitor is connected with the equivalent capacitor of the capacitive touch button in parallel and connected with the detection resistor;

the detection resistor is connected with the processing module;

when the detection circuit works, the processing module sends continuous pulse signals to the detection circuit and receives constant current signals fed back by the detection circuit; when the capacitive touch button fails, the constant current signal is distorted;

when the distortion amplitude of the constant current signal reaches a preset value, the processing module sends a corresponding switch signal to the driving module;

and the driving module sends out fault warning according to the switching signal, closes the gas appliance and controls each corresponding electric control valve of the gas appliance to be opened or closed.

Preferably, the processing module is a single chip microcomputer.

More preferably, the single chip microcomputer is a CY8C41XX-S series single chip microcomputer.

Preferably, the driving module comprises a switching signal receiver and a controller;

the controller comprises a plurality of normally open contacts and a plurality of normally closed contacts;

each normally open contact and each normally closed contact are connected with the corresponding electric control valve and control the corresponding electric control valve.

More preferably, the electrically controlled valve is an electrically operated valve or an electromagnetic valve.

The utility model has the advantages that:

the utility model discloses can real-time automatic discrimination capacitanc touch button whether inefficacy, in case the trouble condition appears, in the time of showing warning information, can in time close the running state of gas utensil, eliminate the potential safety hazard of product.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

Drawings

Fig. 1 shows a schematic circuit diagram of an embodiment of the present invention.

Fig. 2 shows a schematic circuit diagram of a driving module according to an embodiment of the present invention.

Detailed Description

Examples

As shown in fig. 1, the gas appliance capacitive touch button failure detection device includes a capacitive touch button 1, a processing module 2 and a driving module 6.

A detection circuit is arranged between the capacitive touch button 1 and the processing module 2;

the detection circuit comprises a detection capacitor 3, an NMOS tube 4 and a detection resistor 5;

the grid electrode of the NMOS tube 4 is connected with the processing module 2, the drain electrode is grounded, and the source electrode is connected with the detection capacitor 3;

the other end of the detection capacitor 3 is connected with the equivalent capacitor of the capacitive touch button 1 in parallel and is connected with the detection resistor 5;

the detection resistor 5 is connected with the processing module 2;

when the device works, the processing module 2 sends continuous pulse signals to the detection circuit and receives constant current signals fed back by the detection circuit; when the capacitive touch button 1 fails, the constant current signal is distorted;

when the distortion amplitude of the constant current signal reaches a preset value, the processing module 2 sends a corresponding switch signal to the driving module 6;

the driving module 6 sends out fault warning according to the switching signal, simultaneously closes the gas appliance, and controls each corresponding electric control valve 7 of the gas appliance to be opened or closed.

When the capacitance type touch button 1 breaks down and the gas appliance is closed, the gas source needs to be closed in time, and meanwhile, the gas in the gas appliance needs to be emptied to ensure safety, so that part of the electric control valves 7 of the gas appliance need to be closed to block the gas from entering, and the other part of the electric control valves 7 need to be opened to empty the gas in the gas appliance in time.

The principle of the utility model is as follows:

in a normal state, i.e. without turning on the NMOS transistor 4, the processing module 2 detects a capacitance value of the equivalent capacitance of the capacitive touch button 1.

When the processing module 2 sends a signal to the NMOS transistor 4, the total capacitance value of the equivalent capacitance of the capacitance 3 and the capacitive touch button 1 is detected, a constant current signal is generated in the process, and it can be determined that the corresponding capacitive touch button 1 has no fault as long as the constant current signal is within a preset range.

And in case of a failure of the capacitive touch button 1, the equivalent capacitance of the capacitive touch button 1 is disabled:

when the processing module 2 sends a signal to the NMOS transistor 4, the constant current signal is distorted, and it can be determined that the corresponding capacitive touch button 1 is disabled.

In some embodiments, the processing module 2 is a single chip.

In some embodiments, the single chip microcomputer is a CY8C41XX-S series single chip microcomputer.

As shown in fig. 2, in certain embodiments, the drive module 6 includes a switching signal receiver 61 and a controller 62;

the controller 62 includes a plurality of normally open contacts 63 and a plurality of normally closed contacts 64;

each normally open contact 63 and each normally closed contact 64 is connected to the corresponding electrically controlled valve 7 and controls the corresponding electrically controlled valve 7.

In some embodiments, the electrically controlled valve 7 is an electrically or solenoid valve.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. The gas appliance capacitive touch button failure detection device comprises a capacitive touch button (1), a processing module (2) and a driving module (6); the method is characterized in that:

a detection circuit is arranged between the capacitive touch button (1) and the processing module (2);

the detection circuit comprises a detection capacitor (3), an NMOS (N-channel metal oxide semiconductor) tube (4) and a detection resistor (5);

the grid electrode of the NMOS tube (4) is connected with the processing module (2), the drain electrode is grounded, and the source electrode is connected with the detection capacitor (3);

the other end of the detection capacitor (3) is connected with the equivalent capacitor of the capacitive touch button (1) in parallel and connected with the detection resistor (5);

the detection resistor (5) is connected with the processing module (2);

when the circuit works, the processing module (2) sends continuous pulse signals to the detection circuit and receives constant current signals fed back by the detection circuit; when the capacitive touch button (1) fails, the constant current signal is distorted;

when the distortion amplitude of the constant current signal reaches a preset value, the processing module (2) sends a corresponding switching signal to the driving module (6);

and the driving module (6) sends out fault warning according to the switching signal, closes the gas appliance and controls each corresponding electric control valve (7) of the gas appliance to be opened or closed.

2. The gas appliance capacitive touch button failure detection device according to claim 1, wherein the processing module (2) is a single chip microcomputer.

3. The gas appliance capacitive touch button failure detection device according to claim 2, wherein the single chip microcomputer is a CY8C41XX-S series single chip microcomputer.

4. Gas appliance capacitive touch button failure detection device according to claim 1, characterized in that said driving module (6) comprises a switching signal receiver (61) and a controller (62);

the controller (62) comprises a plurality of normally open contacts (63) and a plurality of normally closed contacts (64);

each normally open contact (63) and each normally closed contact (64) are connected with the corresponding electric control valve (7) and control the corresponding electric control valve (7).

5. The gas appliance capacitive touch button failure detection device according to any one of claims 1 to 4, wherein the electrically controlled valve (7) is an electrically or solenoid operated valve.