CN109346341A - It is a kind of that switch contact is avoided to aoxidize, get rusty and adhere to the circuit that greasy dirt causes to judge by accident - Google Patents
It is a kind of that switch contact is avoided to aoxidize, get rusty and adhere to the circuit that greasy dirt causes to judge by accident Download PDFInfo
- Publication number
- CN109346341A CN109346341A CN201811298572.7A CN201811298572A CN109346341A CN 109346341 A CN109346341 A CN 109346341A CN 201811298572 A CN201811298572 A CN 201811298572A CN 109346341 A CN109346341 A CN 109346341A
- Authority
- CN
- China
- Prior art keywords
- resistance
- switch
- comparator
- key
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims description 20
- 230000003647 oxidation Effects 0.000 claims description 9
- 238000007254 oxidation reaction Methods 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 8
- 238000012913 prioritisation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000007257 malfunction Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/0015—Means for testing or for inspecting contacts, e.g. wear indicator
Landscapes
- Keying Circuit Devices (AREA)
Abstract
The present invention relates to switch monitors technical fields, more particularly to one kind avoids switch contact from aoxidizing, getting rusty and adhering to greasy dirt leads to the circuit judged by accident, including key switch internal resistance conversion circuit, reference voltage generating circuit and comparator, the switch internal resistance value of key switch is converted into an input terminal of voltage value input comparator by key switch internal resistance conversion circuit, another input terminal of reference voltage generating circuit connection comparator, the open and close of key switch is judged by comparator, the switch internal resistance value of key switch thinks to close the switch when being less than the threshold values of switch resistance, the switch internal resistance value of key switch thinks that switch disconnects when being greater than the threshold values of switch resistance.Switching signal is carried out processing and is converted into resistance value by the present invention, prevents from switching insensitive caused erroneous judgement due to aoxidizing, get rusty and adhering to for a long time after greasy dirt.
Description
Technical field
The present invention relates to switch monitors technical fields more particularly to one kind to avoid switch contact from aoxidizing, get rusty and attaching oil
Dirt leads to the circuit of erroneous judgement.
Background technique
Switching circuit refers to the circuit with " on " and "off" two states, switching circuit is common be by switch and on
Pull-up resistor composition, is illustrated in figure 5 switching circuit, and when the switch is closed, output end key-mcu is low level, when switch disconnects
When output end key-mcu be high level Vcc.
Resistance is 0 ohm between contact when perfect switch is closed.But after switch is due to aoxidizing for a long time, getting rusty, adhere to greasy dirt
There are switch internal resistances between switch contact, are illustrated in figure 6 switch equivalent circuit, and when the switch is closed, switch internal resistance may be from several
Ohm increases to even one kilohm of several hundred ohms, if switch internal resistance RSwitchIt is identical as the resistance value of resistance R0, at this point, key-mcu
Voltage beIt can not then judge whether switch is closed.
Switch contact oxidation adheres to greasy dirt, gets rusty mouldy, and usually internal copper core encounters moister, oil smoke environment
And cause.Switch aoxidize, get rusty, adhere to greasy dirt after will cause poor contact, so that internal resistance becomes larger between contact, cause to switch ineffective
It is quick, to will appear some malfunctions, when the switch is closed, since switch contact resistance becomes larger, lead to subsequent reading and processing
Circuit can not correctly judge switching signal, so aoxidizing, adhering to greasy dirt, the mouldy switch that gets rusty cannot continue to use.
Summary of the invention
It avoids switch contact from aoxidizing, get rusty and adhere to the circuit that greasy dirt causes to judge by accident the present invention provides a kind of, will switch
Signal carries out processing and is converted into resistance value, prevent due to aoxidize, get rusty and adhere to for a long time after greasy dirt switch it is insensitive caused
Erroneous judgement.
In order to achieve the object of the present invention, used technical solution is: one kind avoid switch contact oxidation, get rusty with it is attached
Greasy dirt lead to the circuit of erroneous judgement, including key switch internal resistance conversion circuit, reference voltage generating circuit and comparator U1, key
The switch internal resistance value of key switch S1 is converted into an input terminal of voltage value input comparator U1 by switch internal resistance conversion circuit,
Reference voltage generating circuit connects another input terminal of comparator U1, by comparator U1 judge the closure of key switch S1 with
It disconnects, the switch internal resistance value R of key switch S1SwitchLess than switch resistance threshold values when think to close the switch, key switch S1's opens
Resistance value R inside the PassSwitchGreater than switch resistance threshold values when think switch disconnect.
As prioritization scheme of the invention, key switch internal resistance conversion circuit includes first resistor R1, and reference voltage generates
Circuit includes second resistance R2 and 3rd resistor R3；One end of first resistor R1 connects power supply, the other end of first resistor R1 and
One end of key switch S1 is connected with an input terminal of comparator U1, the other end ground connection of key switch S1；Second resistance
One end of R2 connects power supply, and the other end of second resistance R2 and one end of 3rd resistor R3 are both connected to another of comparator U1
On input terminal, the other end of 3rd resistor R3 is grounded, at this point, the threshold values of switch resistance are as follows:
Wherein: R1For the resistance value of first resistor R1, R2For the resistance value of second resistance R2, R3For the resistance value of 3rd resistor R3.
As prioritization scheme of the invention, to avoid ripple from causing switch judgement malfunction, reference voltage generating circuit is also
Including the 4th resistance R4, one end of the 4th resistance R4 is connected on another input terminal of comparator U1, and the 4th resistance R4's is another
The output end of one termination comparator U1, when comparator U1 exports low level, the threshold values of switch resistance are as follows:
Wherein: R4For the resistance value of 3rd resistor R4.
As prioritization scheme of the invention, key switch internal resistance conversion circuit further includes the first filter capacitor C1, the first filter
One end of wave capacitor C1 is connected on an input terminal of comparator U1, the other end ground connection of the first filter capacitor C1.
As prioritization scheme of the invention, key switch internal resistance conversion circuit includes the 5th resistance R5 and the 6th resistance R6,
The reference voltage generating circuit includes the 8th resistance R8 and the 9th resistance R9；One end of 5th resistance R5 connects key switch
One end of S1, the other end ground connection of key switch S1, the other end of the 5th resistance R5 and one end of the 6th resistance R6 are both connected to
On another input terminal of comparator U1, the other end of the 6th resistance R6 connects power supply；A termination power of 8th resistance R8, the
The other end of eight resistance R8 and one end of the 9th resistance R9 are connected on an input terminal of comparator U1, and the 9th resistance R9's is another
One end ground connection, at this point, the threshold values of switch resistance are as follows:
Wherein: R5For the resistance value of the 5th resistance R5, R6For the resistance value of the 6th resistance R6, R8For the resistance value of the 8th resistance R8, R9
For the resistance value of the 9th resistance R9.
As prioritization scheme of the invention, to avoid ripple from causing switch judgement malfunction, key switch internal resistance conversion electricity
Including further including the 7th resistance R7, one end of the 7th resistance R7 is connected on another input terminal of comparator U1 on road, the 7th electricity
Hinder the output end of another termination comparator U1 of R7.
As prioritization scheme of the invention, key switch internal resistance conversion circuit include further include third filter capacitor C3, the
One end of a termination key switch S1 of three filter capacitor C3, the other end ground connection of third filter capacitor C3.
The present invention has the effect of positive: switching signal processing is converted into resistance value and calculated by the present invention, and key is opened
The switch internal resistance value of pass thinks to close the switch when being less than the threshold values of switch resistance, and the switch internal resistance value of key switch is greater than switch electricity
Think that switch disconnects when the threshold values of resistance, prevents from switching and switch insensitive appearance after greasy dirt due to aoxidizing, getting rusty for a long time, adhering to
Erroneous judgement, circuit structure is simple, at low cost.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the circuit diagram of the embodiment of the present invention 1；
Fig. 2 is that the embodiment of the present invention 1 increases the circuit diagram after the 4th resistance；
Fig. 3 is the circuit diagram of the embodiment of the present invention 2；
Fig. 4 is that the embodiment of the present invention 2 increases the circuit diagram after the 7th resistance；
Fig. 5 is common switching circuit figure；
Fig. 6 is to aoxidize, get rusty and adhere to the switch equivalent circuit figure after greasy dirt.
Wherein: 1, key switch internal resistance conversion circuit, 2, reference voltage generating circuit.
Specific embodiment
As shown in Figs 1-4, the invention discloses it is a kind of avoid switch contact oxidation, get rusty and adhere to greasy dirt cause judge by accident
Circuit, including key switch internal resistance conversion circuit 1, reference voltage generating circuit 2 and comparator U1, key switch internal resistance conversion electricity
The switch internal resistance value of key switch S1 is converted into an input terminal of voltage value input comparator U1 by road 1, and reference voltage generates
Circuit 2 connects another input terminal of comparator U1, judges that the open and close of key switch S1, key are opened by comparator U1
Close the switch internal resistance value R of S1SwitchLess than switch resistance threshold values when think to close the switch, the switch internal resistance value R of key switch S1Switch
Greater than switch resistance threshold values when think switch disconnect.
Embodiment 1
As shown in Figure 1, key switch internal resistance conversion circuit 1 includes first resistor R1, the reference voltage generating circuit
Including second resistance R2 and 3rd resistor R3；One end of first resistor R1 connects power supply, the other end and key of first resistor R1
One end of switch S1 is connected with an input terminal of comparator U1, the other end ground connection of key switch S1；Second resistance R2's
One end connects power supply, and the other end of second resistance R2 and one end of 3rd resistor R3 are both connected to another input of comparator U1
On end, the other end of 3rd resistor R3 is grounded, at this point, the threshold values of switch resistance are as follows:
Wherein: R1For the resistance value of first resistor R1, R2For the resistance value of second resistance R2, R3For the resistance value of 3rd resistor R3.The
Two resistance R2 and 3rd resistor R3 divide to obtain another input terminal of reference voltage Vref access comparator U1, key switch S1
With an input terminal of the partial pressure access comparator U1 of first resistor R1.
As key switch S1 disconnection or the switch internal resistance value R of key switch S1SwitchGreater than the threshold values R of switch resistanceValveWhen,
The negative terminal voltage of comparator U1 is Vcc, and the anode voltage of comparator U1 is lower than the negative terminal voltage of comparator U1, so, comparator
The 1 foot output of U1 is low level；As key switch S1 closure or the switch internal resistance value R of key switch S1SwitchLess than switch resistance
Threshold values RValveWhen, the anode voltage of comparator U1 is greater than the negative terminal voltage of comparator U1, and 1 foot of comparator U1 exports high level,
The signal of KEY_MCU passes to the judgement that signal processing circuit below carries out level value.
As shown in Fig. 2, reference voltage generating circuit further includes the 4th resistance R4, one end of the 4th resistance R4, which is connected to, compares
On another input terminal of device U1, the output end of another termination comparator U1 of the 4th resistance R4, when comparator U1 exports low electricity
Usually, the threshold values of switch resistance are as follows:
Wherein: R4For the resistance value of 3rd resistor R4.
When comparator U1 exports high level, the threshold values of switch resistance are as follows:
Key switch internal resistance conversion circuit further includes the first filter capacitor C1, and one end of the first filter capacitor C1 is connected to ratio
On an input terminal compared with device U1, the other end of the first filter capacitor C1 is grounded.
The switch internal resistance value of key switch S1 is converted into voltage value by the key switch internal resistance conversion circuit of the present embodiment 1,
The switch internal resistance value R of key switch S1SwitchLess than switch resistance threshold values when think to close the switch, in the switch of key switch S1
Resistance value RSwitchGreater than switch resistance threshold values when think switch disconnect, can be followed by touching to avoid due to aoxidizing, getting rusty, adhering to greasy dirt
Resistance, which becomes larger, leads to the erroneous judgement of switch.
Embodiment 2
As shown in figure 3, key switch internal resistance conversion circuit includes the 5th resistance R5 and the 6th resistance R6, the benchmark electricity
Pressing generation circuit includes the 8th resistance R8 and the 9th resistance R9；One end of one end connection key switch S1 of 5th resistance R5, is pressed
The other end of key switch S1 is grounded, and the other end of the 5th resistance R5 and one end of the 6th resistance R6 are both connected to the another of comparator U1
On one input terminal, the other end of the 6th resistance R6 connects power supply；A termination power of 8th resistance R8, the 8th resistance R8's is another
One end and one end of the 9th resistance R9 are connected on an input terminal of comparator U1, the other end ground connection of the 9th resistance R9, this
When, the threshold values of switch resistance are as follows:
Wherein: R5For the resistance value of the 5th resistance R5, R6For the resistance value of the 6th resistance R6, R8For the resistance value of the 8th resistance R8, R9
For the resistance value of the 9th resistance R9.
As shown in figure 4, it further includes the 7th resistance R7 that key switch internal resistance conversion circuit, which includes, one end of the 7th resistance R7 connects
It connects on another input terminal of comparator U1, the output end of another termination comparator U1 of the 7th resistance R7.In key switch
For resistance conversion circuit including further including third filter capacitor C3, the one of third filter capacitor C3 terminates one end of key switch S1, the
The other end of three filter capacitor C3 is grounded.
As key switch S1 disconnection or the switch internal resistance value R of key switch S1SwitchGreater than the threshold values R of switch resistanceValveWhen,
The anode voltage of comparator U1 is Vcc, and the negative terminal voltage of comparator U1 is lower than the anode voltage of comparator U1, so, comparator
The 1 foot output of U1 is high level；As key switch S1 closure or the switch internal resistance value R of key switch S1SwitchLess than switch resistance
Threshold values RValveWhen, the anode voltage of comparator U1 is less than the negative terminal voltage of comparator U1, and 1 foot of comparator U1 exports low level,
The signal of KEY_MCU passes to the judgement that signal processing circuit below carries out level value.
Wherein, comparator U1 selected by embodiment 1 and embodiment 2 is push-pull fashion output, and output end does not need to pull up
Resistance.Capacitor in 2 circuit diagram of embodiment 1 and embodiment is filter capacitor.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (7)
1. a kind of avoid switch contact from aoxidizing, get rusty and adhere to the circuit that greasy dirt causes to judge by accident, it is characterised in that: opened including key
Hinder conversion circuit (1), reference voltage generating circuit (2) and comparator U1 inside the Pass, key switch internal resistance conversion circuit (1) is by key
The switch internal resistance value of switch S1 is converted into an input terminal of voltage value input comparator U1, and reference voltage generating circuit (2) is even
Another input terminal for meeting comparator U1 judges the open and close of key switch S1 by comparator U1, key switch S1's
Switch internal resistance value RSwitchLess than switch resistance threshold values when think to close the switch, the switch internal resistance value R of key switch S1SwitchGreater than opening
Think that switch disconnects when the threshold values of powered-down resistance.
2. it is according to claim 1 it is a kind of avoid switch contact oxidation, get rusty and adhere to greasy dirt cause judge by accident circuit,
Be characterized in that: the key switch internal resistance conversion circuit (1) includes first resistor R1, the reference voltage generating circuit packet
Include second resistance R2 and 3rd resistor R3；One end of first resistor R1 connects power supply, and the other end and key of first resistor R1 is opened
The one end for closing S1 is connected with an input terminal of comparator U1, the other end ground connection of key switch S1；The one of second resistance R2
End connection power supply, the other end of second resistance R2 and one end of 3rd resistor R3 are both connected to another input terminal of comparator U1
On, the other end of 3rd resistor R3 is grounded, at this point, the threshold values of switch resistance are as follows:
Wherein: R1For the resistance value of first resistor R1, R2For the resistance value of second resistance R2, R3For the resistance value of 3rd resistor R3.
3. it is according to claim 2 it is a kind of avoid switch contact oxidation, get rusty and adhere to greasy dirt cause judge by accident circuit,
Be characterized in that: the reference voltage generating circuit further includes the 4th resistance R4, and one end of the 4th resistance R4 is connected to comparator
On another input terminal of U1, the output end of another termination comparator U1 of the 4th resistance R4, when comparator U1 exports low level
When, the threshold values of switch resistance are as follows:
Wherein: R4For the resistance value of 3rd resistor R4.
4. it is according to claim 2 or 3 it is a kind of avoid switch contact oxidation, get rusty and adhere to greasy dirt cause judge by accident electricity
Road, it is characterised in that: the key switch internal resistance conversion circuit further includes the first filter capacitor C1, the first filter capacitor C1's
One end is connected on an input terminal of comparator U1, the other end ground connection of the first filter capacitor C1.
5. it is according to claim 1 it is a kind of avoid switch contact oxidation, get rusty and adhere to greasy dirt cause judge by accident circuit,
Be characterized in that: the key switch internal resistance conversion circuit includes the 5th resistance R5 and the 6th resistance R6, the reference voltage
Generation circuit includes the 8th resistance R8 and the 9th resistance R9；One end of one end connection key switch S1 of 5th resistance R5, key
The other end of switch S1 is grounded, and the other end of the 5th resistance R5 and one end of the 6th resistance R6 are both connected to the another of comparator U1
On a input terminal, the other end of the 6th resistance R6 connects power supply；A termination power of 8th resistance R8, the 8th resistance R8's is another
End and one end of the 9th resistance R9 are connected on an input terminal of comparator U1, the other end ground connection of the 9th resistance R9, at this point,
The threshold values of switch resistance are as follows:
Wherein: R5For the resistance value of the 5th resistance R5, R6For the resistance value of the 6th resistance R6, R8For the resistance value of the 8th resistance R8, R9It is
The resistance value of nine resistance R9.
6. it is according to claim 5 it is a kind of avoid switch contact oxidation, get rusty and adhere to greasy dirt cause judge by accident circuit,
Be characterized in that: the key switch internal resistance conversion circuit is including further including the 7th resistance R7, one end connection of the 7th resistance R7
On another input terminal of comparator U1, the output end of another termination comparator U1 of the 7th resistance R7.
7. it is according to claim 5 or 6 it is a kind of avoid switch contact oxidation, get rusty and adhere to greasy dirt cause judge by accident electricity
Road, it is characterised in that: the key switch internal resistance conversion circuit is including further including third filter capacitor C3, third filter capacitor
One end of a termination key switch S1 of C3, the other end ground connection of third filter capacitor C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811298572.7A CN109346341A (en) | 2018-11-02 | 2018-11-02 | It is a kind of that switch contact is avoided to aoxidize, get rusty and adhere to the circuit that greasy dirt causes to judge by accident |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811298572.7A CN109346341A (en) | 2018-11-02 | 2018-11-02 | It is a kind of that switch contact is avoided to aoxidize, get rusty and adhere to the circuit that greasy dirt causes to judge by accident |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109346341A true CN109346341A (en) | 2019-02-15 |
Family
ID=65313420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811298572.7A Pending CN109346341A (en) | 2018-11-02 | 2018-11-02 | It is a kind of that switch contact is avoided to aoxidize, get rusty and adhere to the circuit that greasy dirt causes to judge by accident |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109346341A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654107A (en) * | 2020-06-11 | 2020-09-11 | 国家电网有限公司华东分部 | An Analysis System of Equipment Knife Gate Status Based on Image Recognition |
| CN120446732A (en) * | 2025-04-19 | 2025-08-08 | 成都高稀斯科技有限公司 | Electrical switch unit, electrical switch unit life detection system and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10506750A (en) * | 1994-12-14 | 1998-06-30 | ユナイテッド テクノロジーズ コーポレイション | True hysteresis window comparator |
| CN204836131U (en) * | 2015-08-11 | 2015-12-02 | 北京经纬恒润科技有限公司 | Effective switch input signal acquisition circuit of high level |
| CN204836123U (en) * | 2015-06-29 | 2015-12-02 | 惠州市凯越电子有限公司 | Key switch detection circuitry |
-
2018
- 2018-11-02 CN CN201811298572.7A patent/CN109346341A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10506750A (en) * | 1994-12-14 | 1998-06-30 | ユナイテッド テクノロジーズ コーポレイション | True hysteresis window comparator |
| CN204836123U (en) * | 2015-06-29 | 2015-12-02 | 惠州市凯越电子有限公司 | Key switch detection circuitry |
| CN204836131U (en) * | 2015-08-11 | 2015-12-02 | 北京经纬恒润科技有限公司 | Effective switch input signal acquisition circuit of high level |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654107A (en) * | 2020-06-11 | 2020-09-11 | 国家电网有限公司华东分部 | An Analysis System of Equipment Knife Gate Status Based on Image Recognition |
| CN120446732A (en) * | 2025-04-19 | 2025-08-08 | 成都高稀斯科技有限公司 | Electrical switch unit, electrical switch unit life detection system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208174241U (en) | A kind of leakage protection circuit | |
| CN207965562U (en) | CAN bus terminal resistance configuration circuit | |
| CN209086312U (en) | A kind of CP detection circuit applied to alternating current charging stake | |
| CN109787305A (en) | Charging unit and charging system | |
| CN106130537B (en) | A kind of 1OO2D functional safety digital quantity output circuit | |
| CN109346341A (en) | It is a kind of that switch contact is avoided to aoxidize, get rusty and adhere to the circuit that greasy dirt causes to judge by accident | |
| CN104236594B (en) | Safety edge state detection circuit | |
| CN101639669A (en) | Power switching circuit | |
| CN104467811A (en) | Anti-interference on-off input circuit | |
| CN209690463U (en) | Power battery high voltage relay control circuit | |
| CN208158100U (en) | A kind of output overvoltage protection circuit and the power supply comprising the circuit | |
| CN101557099B (en) | Module power supply short-circuit protective circuit | |
| CN208571589U (en) | Switching Power Supply is lightly loaded short-circuit protection circuit | |
| CN103401510B (en) | A kind of power amplifier of band warm connection function | |
| CN206948205U (en) | A kind of network synthesis multiplexing equipment | |
| CN207021661U (en) | DC voltage supply circuit | |
| CN212781164U (en) | Circuit and system capable of simultaneously detecting grounding condition and reverse connection of zero line and live line | |
| CN221926545U (en) | Switch state detection circuit, battery management system and battery system | |
| CN209216059U (en) | Trigger control circuit pen starting or closed | |
| CN207530796U (en) | A kind of automatic reset circuit for controller | |
| CN201781287U (en) | Signal collector of self-adapting switch | |
| CN222365065U (en) | Charging pile neutral line live line relay detection circuit and charging pile | |
| CN206517431U (en) | A kind of RS485 line selectors circuit | |
| CN206136310U (en) | A equipment for discerning house model | |
| CN204128571U (en) | A kind of safe touch side state detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190215 |