CN113794471B - Circuit and method for delaying key corrosion and control handle - Google Patents
Circuit and method for delaying key corrosion and control handle Download PDFInfo
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- CN113794471B CN113794471B CN202111063309.1A CN202111063309A CN113794471B CN 113794471 B CN113794471 B CN 113794471B CN 202111063309 A CN202111063309 A CN 202111063309A CN 113794471 B CN113794471 B CN 113794471B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/14—Modifications for compensating variations of physical values, e.g. of temperature
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/96—Touch switches
- H03K2217/96058—Fail-safe touch switches, where switching takes place only after repeated touch
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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Abstract
A circuit and a method for delaying key corrosion and a control handle comprise a key, a biasing unit and a main controller, wherein the biasing unit is connected with the key, and the circuit and the method are characterized in that: setting a power supply output end of the main controller to output pulse voltage with the amplitude of V1; the power supply device comprises a power supply output end, a bias unit, a conditioning unit, a switching unit and a switching unit, wherein the input end of the switching unit is connected with the power supply output end to switch pulse voltage with the amplitude of V1 into pulse voltage with the amplitude of V2, V2 is less than V1, and the output end of the switching unit is connected with the bias unit and the conditioning unit and enables the key potential to be smaller than the water electrolysis potential; the input end of the conditioning unit is connected with the keys to couple and amplify signals, and the detection end of the main controller is connected with the output of the conditioning unit to detect the states of the keys. The electric field bias time acting on the keys and the potential of the keys are respectively reduced from software and hardware, so that the potential of the keys is smaller than the water electrolysis potential, the electrolytic corrosion rate of the keys is reduced, and the corrosion of the keys is delayed.
Description
Technical Field
The invention relates to the field of keys, in particular to a circuit and a method for delaying key corrosion and a control handle.
Background
Most of intelligent toilet bowl application scenes are humid environments, and although traditional product boards are sprayed with three-proofing paint or glue, key handles are still exposed outside and cannot be completely sealed in glue; when a user operates the key, the key is corroded by water vapor in a humid environment, so that the key is invalid; because the very small amount of adsorbed liquid film or corrosion products can have serious influence on the performance of components, the service life of the wet environment is reduced compared with that of the conventional environment.
The metal corrosion includes chemical corrosion and electrolytic corrosion. Wherein chemical corrosion occurs spontaneously, and is classified into in air (oxygen-absorbing corrosion) and in liquid (hydrogen-evolving corrosion); oxygen inhalation corrosion, in weak acid or neutral medium, oxygen in positive electrode gets electrons to form hydroxyl, active metal discharges in negative electrode to lose electrons as iron ion; and (3) hydrogen evolution corrosion, namely discharging active metal in an acidic medium to form iron ions at a negative electrode, and reducing the hydrogen ions of a positive electrode to hydrogen.
Factors generated by electrolytic corrosion include medium (water), electric field and time, and are that oxidizing ions with high electrode potential are reduced in cathode discharge after a power supply is externally applied, and more active metal electrons with low electrode potential in anode region are oxidized into cations which are separated from the surface of a material to form corrosion of the anode, when the circuit is incorrectly installed, the grounding is poor, leakage current generated by aging of insulating materials or equipment moisture and the like can generate electrolytic corrosion in the anode region through metal.
Referring to fig. 1, the key circuit of the traditional intelligent toilet is designed simply, the key is under electric field bias for a long time, when the key is wet or contacts water, a continuous electrolytic corrosion phenomenon is formed between two metals of the key, the conduction resistance of the key is increased according to the metal corrosion principle, the phenomenon that the key is poor in contact and does not respond is caused, and even a dome sheet, namely a metal spring sheet is broken is caused; the protection method of the traditional key-press spraying three-proofing paint cannot solve the factors generated by electrolytic corrosion, and the material cost, time cost and labor cost of the traditional key-press spraying three-proofing paint or glue filling and the like in the production process are high.
Disclosure of Invention
The invention aims to overcome the defects of a key circuit in the prior art and provides a circuit and a method for delaying key corrosion and a control handle.
The invention adopts the following technical scheme:
the utility model provides a delay button circuit of corruption, includes button, biasing unit and main control unit, and this biasing unit links to each other with the button, its characterized in that: setting a power supply output end of the main controller to output pulse voltage with the amplitude of V1; the power supply device comprises a power supply output end, a bias unit, a conditioning unit, a switching unit and a switching unit, wherein the input end of the switching unit is connected with the power supply output end to switch pulse voltage with the amplitude of V1 into pulse voltage with the amplitude of V2, V2 is less than V1, and the output end of the switching unit is connected with the bias unit and the conditioning unit and enables the key potential to be smaller than the water electrolysis potential; the input end of the conditioning unit is connected with the keys to couple and amplify signals, and the detection end of the main controller is connected with the output of the conditioning unit to detect the states of the keys.
Preferably, the bias unit comprises a first resistor and a second resistor, one end of the first resistor is connected with one end of the second resistor and one end of the key, the other end of the first resistor and the other end of the key are grounded, and the other end of the second resistor is connected with the output end of the conversion unit.
Preferably, the conversion unit adopts a voltage stabilizing chip or a voltage reducing chip.
Preferably, the conditioning unit comprises a coupling capacitor and an amplifying circuit, wherein the input end of the coupling capacitor is connected with one end of the key, and the output end of the coupling capacitor is connected with the input end of the amplifying circuit; the output end of the amplifying circuit is connected with the detection end of the main controller.
Preferably, the amplifying circuit comprises a triode, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; the base electrode of the triode is connected with one end of the key, one end of the third resistor and one end of the fourth resistor, the collector electrode of the triode is connected with one end of the fifth resistor and one end of the sixth resistor, and the other ends of the third resistor and the fifth resistor are connected with the output end of the conversion unit; the other end of the sixth resistor is connected with the detection end of the main controller, and the other ends of the emitting electrode and the fourth electrode of the triode are grounded.
Preferably, the pulse voltage V1 is a PWM pulse voltage, the duty cycle range is < 10%, the period range is 15-25ms, and the pulse width range is 1.5-2.5ms. The value range of V1 is 4.5-5.5V, and the value range of V2 is 3.0-3.3V.
The potential range of the key is < 1.23V.
A control handle, includes the handle body, its characterized in that: the handle body is provided with any one of the circuits for delaying button corrosion.
A method for delaying key corrosion is characterized in that: setting a power supply output end of the main controller to output pulse voltage with the amplitude of V1, converting the pulse voltage with the amplitude of V1 into pulse voltage with the amplitude of V2, and outputting the pulse voltage to the bias unit so as to reduce the electric field bias time acting on the keys and the potential of the keys, wherein V2 is less than V1, and the key potential is less than the water electrolysis potential; meanwhile, a conditioning unit is arranged between the detection end of the main controller and the keys to couple and amplify signals so as to detect the key states.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
1. in the invention, the software part sets the pulse voltage with the amplitude of V1 at the power supply output end of the main controller, the hardware part sets the conversion unit and the conditioning unit, and the realization of reducing the electric field bias time acting on the keys and the potential of the keys is realized, so that the potential of the keys is smaller than the water electrolysis potential, thereby reducing the electrolysis corrosion rate of the keys, delaying the corrosion of the keys, and saving the raw material cost of spraying three-proofing paint or pouring glue in the traditional method in the process production, the time cost of spraying paint or pouring glue and the like and the labor cost.
2. In the invention, the conversion unit adopts the voltage stabilizing chip or the voltage reducing chip, and can convert the pulse voltage with the amplitude of V1 into the pulse voltage with the amplitude of V2, namely, the strength of the power supply voltage is reduced, and the conversion unit is a biasing unit and a conditioning unit, so that the key potential is reduced, and the electrolytic corrosion rate is reduced.
3. In the invention, the power supply output voltage is set as PWM pulse voltage, the duty ratio range is less than 10%, the period range is 15-25ms, the pulse width range is 1.5-2.5ms, and the electric field bias time of the power supply output voltage acting on the keys through the conversion unit and the bias unit is greatly reduced compared with the traditional mode, thereby reducing the electrolytic corrosion rate.
Drawings
FIG. 1 is a circuit diagram of a conventional key;
FIG. 2 is a circuit diagram of the present invention;
FIG. 3 is a timing diagram of the power supply output of the main controller;
FIG. 4 is a timing diagram of the detection end of the main controller;
FIG. 5 is a comparative experimental plot of the present invention;
wherein:
10. the power supply device comprises a main controller, 11, a power supply output end, 12, a detection end, 20, a conversion unit, 30, a conditioning unit, R1, a first resistor, R2, a second resistor, R3, a third resistor, R4, a fourth resistor, R5, a fifth resistor, R6, a sixth resistor, C1, a coupling capacitor, Q1, a triode, S1 and a key.
The invention is further described in detail below with reference to the drawings and the specific examples.
Detailed Description
The invention is further described below by means of specific embodiments.
In the present invention, the terms "first," "second," "third," and the like are used merely to distinguish between similar objects and not necessarily to describe a particular sequence or order, nor are they to be construed as indicating or implying a relative importance. In the description, the directions or positional relationships indicated by "upper", "lower", "left", "right", "front" and "rear", etc. are used for convenience of description of the present invention based on the directions or positional relationships shown in the drawings, and are not intended to indicate or imply that the apparatus must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present invention. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In addition, in the description of the present application, unless otherwise indicated, "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
Referring to fig. 2, a circuit for delaying corrosion of a key includes a key S1, a bias unit, a conversion unit 20, a conditioning unit 30, a main controller 10, and the like. The key S1 is a switch key with a metal spring, such as a dome key.
The bias unit is connected with the key S1, the bias unit comprises a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected with one end of the second resistor R2 and one end of the key S1, the other end of the first resistor R1 and the other end of the key S1 are grounded, and the other end of the second resistor R2 is connected with the output end of the conversion unit 20.
The main controller 10 is provided with a power supply output terminal 11 and a detection terminal 12, and the power supply output terminal 11 outputs a power supply voltage, wherein the power supply voltage is set to be a pulse voltage with the amplitude of V1, namely, the main controller 10 outputs interval pulse voltage in a software scanning mode. Referring to fig. 3, for example, the PWM pulse voltage has a duty cycle ranging from < 10%, a period ranging from 15 to 25ms, and a pulse width ranging from 1.5 to 2.5ms. The detecting terminal 12 is configured to detect a signal from the key S1, so as to determine a state of the key S1, i.e., whether the key S1 is opened or closed.
The input of the conversion unit 20 is connected to the power supply output 11 for converting a pulse voltage of amplitude V1 into a pulse voltage of amplitude V2, V2 < V1. The output end of the conversion unit 20 is connected with the bias unit and the conditioning unit 30, that is, the intensity of the power supply voltage is reduced through the conversion unit 20, and the bias unit and the conditioning unit 30 are powered. V1 is in the range of 4.5-5.5V, preferably V1 is 5V, V2 is in the range of 3.0-3.3V, preferably V2 is 3.3V. In practical applications, the conversion unit 20 may be implemented by a voltage stabilizing chip or a voltage reducing chip, for example, AMS1117.
The duty ratio, period and pulse width of the pulse voltage after the voltage reduction by the conversion unit 20 are the same as those before the voltage reduction, and the pulse voltage after the voltage reduction applies a bias electric field on the key S1 by the bias unit. In addition, after depressurization, the potential on the key S1 also decreases, i.e., the potential of the key S1 is less than the electrolysis potential, the potential range of the key S1 is < 1.23V, and the electrolysis potential is 1.23-1.29V.
The input end of the conditioning unit 30 is connected with the key S1 to couple and amplify signals, and the detection end 12 of the main controller 10 is connected with the output of the conditioning unit 30 to detect the state of the key S1. The conditioning unit 30 comprises a coupling capacitor C1 and an amplifying circuit, wherein the input end of the coupling capacitor C1 is connected with one end of the key S1, and the output end of the coupling capacitor C1 is connected with the input end of the amplifying circuit; the output end of the amplifying circuit is connected with the detection end 12 of the main controller 10.
Further, the amplifying circuit comprises a triode Q1, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6; the base electrode of the triode Q1 is connected with one end of a key S1, one end of a third resistor R3 and one end of a fourth resistor R4, the collector electrode of the triode Q1 is connected with one end of a fifth resistor R5 and one end of a sixth resistor R6, and the other end of the third resistor R3 and the other end of the fifth resistor R5 are connected with the output end of the conversion unit 20; the other end of the sixth resistor R6 is connected with the detection end 12 of the main controller 10, and the other ends of the emitter electrode and the fourth electrode of the triode Q1 are grounded.
Referring to fig. 4, when the key S1 is turned off, the transistor Q1 in the conditioning unit 30 is turned on, and the detection end 12 of the main controller 10 cannot detect the pulse signal of the key S1. When the key S1 is closed, in the conditioning unit 30, the triode Q1 is turned off, and the detection end 12 of the main controller 10 can detect the amplified pulse signal of the key S1.
The invention also provides a method for delaying key corrosion, which is characterized in that a power supply output end 11 of the main controller 10 is arranged to output pulse voltage with the amplitude of V1, and the pulse voltage with the amplitude of V1 is converted into pulse voltage with the amplitude of V2 to be output to the bias unit so as to reduce the electric field bias time acting on the key S1 and the potential of the key S1, wherein V2 is smaller than V1; meanwhile, a conditioning unit 30 is arranged between the detection end 12 of the main controller 10 and the key S1 to couple and amplify signals so as to detect the state of the key S1.
In the invention, the software part sets the power supply output end 11 of the main controller 10 to output the pulse voltage with the amplitude of V1, the hardware part sets the conversion unit 20 and the conditioning unit 30 to reduce the electric field bias time acting on the key S1 and the potential of the key S1, so that the potential of the key S1 is smaller than the water electric separation potential (1.23-1.29V), thereby reducing the electrolytic corrosion rate of the key S1 and delaying the corrosion of the key S1.
In addition, referring to fig. 5, when the circuit and the method of the present invention are adopted for experiments, when the PWM pulse voltage v1=5v is set, the period is 20ms, the duty ratios are respectively 0.5, 0.2 and 0.1, and the key electrolysis conditions are respectively observed, it is known that the smaller the duty ratio is, the electrolysis intensity gradually decreases.
The invention also provides a control handle which comprises a handle body, wherein the handle is provided with the circuit for delaying button corrosion. The control handle can be applied to intelligent toilets.
The foregoing is merely illustrative of specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modification of the present invention by using the design concept shall fall within the scope of the present invention.
Claims (8)
1. The utility model provides a delay button circuit of corruption, includes button, biasing unit and main control unit, and this biasing unit links to each other with the button, its characterized in that: setting a power supply output end of the main controller to output pulse voltage with the amplitude of V1; the power supply device comprises a power supply output end, a bias unit, a conditioning unit, a switching unit and a switching unit, wherein the input end of the switching unit is connected with the power supply output end to switch pulse voltage with the amplitude of V1 into pulse voltage with the amplitude of V2, V2 is less than V1, and the output end of the switching unit is connected with the bias unit and the conditioning unit and enables the key potential to be smaller than the water electrolysis potential; the input end of the conditioning unit is connected with the keys to couple and amplify signals, and the detection end of the main controller is connected with the output of the conditioning unit to detect the key state; the bias unit comprises a first resistor and a second resistor, one end of the first resistor is connected with one end of the second resistor and one end of the key, the other end of the first resistor and the other end of the key are grounded, and the other end of the second resistor is connected with the output end of the conversion unit; the conditioning unit comprises a coupling capacitor and an amplifying circuit, wherein the input end of the coupling capacitor is connected with one end of the key, and the output end of the coupling capacitor is connected with the input end of the amplifying circuit; the output end of the amplifying circuit is connected with the detection end of the main controller.
2. A circuit for retarding corrosion of a key as defined in claim 1, wherein: the conversion unit adopts a voltage stabilizing chip or a voltage reducing chip.
3. A circuit for retarding corrosion of a key as defined in claim 1, wherein: the amplifying circuit comprises a triode, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; the base electrode of the triode is connected with one end of the key, one end of the third resistor and one end of the fourth resistor, the collector electrode of the triode is connected with one end of the fifth resistor and one end of the sixth resistor, and the other ends of the third resistor and the fifth resistor are connected with the output end of the conversion unit; the other end of the sixth resistor is connected with the detection end of the main controller, and the other ends of the emitting electrode and the fourth electrode of the triode are grounded.
4. A circuit for retarding corrosion of a key as defined in claim 1, wherein: the pulse voltage V1 is PWM pulse voltage, the duty ratio range is less than 10%, the period range is 15-25ms, and the pulse width range is 1.5-2.5ms.
5. A circuit for retarding corrosion of a key as defined in claim 1, wherein: the value range of V1 is 4.5-5.5V, and the value range of V2 is 3.0-3.3V.
6. A circuit for retarding corrosion of a key as defined in claim 1, wherein: the potential range of the key is < 1.23V.
7. A control handle, includes the handle body, its characterized in that: the handle body is provided with a circuit for retarding key corrosion as claimed in any one of claims 1 to 6.
8. A method for delaying key corrosion is characterized in that: a circuit for delaying key corrosion as claimed in any one of claims 1 to 6, wherein a power supply output end of the main controller is provided for outputting a pulse voltage with an amplitude of V1, and the pulse voltage with the amplitude of V1 is converted into a pulse voltage with the amplitude of V2 to be output to the bias unit so as to reduce the electric field bias time acting on the key and the potential of the key, V2 is less than V1, and the key potential is less than the water electrolysis potential; meanwhile, a conditioning unit is arranged between the detection end of the main controller and the keys to couple and amplify signals so as to detect the key states.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111063309.1A CN113794471B (en) | 2021-09-10 | 2021-09-10 | Circuit and method for delaying key corrosion and control handle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111063309.1A CN113794471B (en) | 2021-09-10 | 2021-09-10 | Circuit and method for delaying key corrosion and control handle |
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| CN113794471A CN113794471A (en) | 2021-12-14 |
| CN113794471B true CN113794471B (en) | 2023-06-20 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6603221B1 (en) * | 1999-04-22 | 2003-08-05 | Zhongdu Liu | Solid state electrical switch |
| CN1716775A (en) * | 2004-04-05 | 2006-01-04 | 富士通天株式会社 | Circuit for preventing corrosion of contact |
| WO2014081339A1 (en) * | 2012-11-23 | 2014-05-30 | Sulimin Yuriy Vladimirovich | Corrosion protection station using pulse current |
| CN204406256U (en) * | 2015-02-02 | 2015-06-17 | 佛山市顺德区美的电热电器制造有限公司 | The feedback circuit of solenoid valve and electromagnetic load equipment |
| CN108649945A (en) * | 2018-05-31 | 2018-10-12 | 苏州攀特电陶科技股份有限公司 | A kind of vibratory drive circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3625473B1 (en) * | 2004-04-05 | 2005-03-02 | 富士通テン株式会社 | Contact corrosion prevention method and apparatus |
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2021
- 2021-09-10 CN CN202111063309.1A patent/CN113794471B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6603221B1 (en) * | 1999-04-22 | 2003-08-05 | Zhongdu Liu | Solid state electrical switch |
| CN1716775A (en) * | 2004-04-05 | 2006-01-04 | 富士通天株式会社 | Circuit for preventing corrosion of contact |
| WO2014081339A1 (en) * | 2012-11-23 | 2014-05-30 | Sulimin Yuriy Vladimirovich | Corrosion protection station using pulse current |
| CN204406256U (en) * | 2015-02-02 | 2015-06-17 | 佛山市顺德区美的电热电器制造有限公司 | The feedback circuit of solenoid valve and electromagnetic load equipment |
| CN108649945A (en) * | 2018-05-31 | 2018-10-12 | 苏州攀特电陶科技股份有限公司 | A kind of vibratory drive circuit |
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