CN209086399U - A kind of danger alarm switch detection circuit - Google Patents
A kind of danger alarm switch detection circuit Download PDFInfo
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- CN209086399U CN209086399U CN201821644838.4U CN201821644838U CN209086399U CN 209086399 U CN209086399 U CN 209086399U CN 201821644838 U CN201821644838 U CN 201821644838U CN 209086399 U CN209086399 U CN 209086399U
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- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Abstract
The application provides a kind of dangerous alarm switch detection circuit, it is related to electronic circuit field, applied to vehicle risk warning circuit, it include: button switch, the first current limiting element, the second current limiting element, first node of button switch is connect with the first terminal of the first current limiting element, second Node connectedness of second current limiting element one end and button switch, the other end of the second current limiting element are connect with the Second terminal of the first current limiting element.By to after the transmission of external detection device after the impedance of the first current limiting element and the common current limliting of the impedance of the second current limiting element or by being detected to from detection electric current after the impedance current limliting of the second current limiting element after the transmission of external detection device, realize the judgement to the switch state of dangerous warning circuit, so as to timely and accurately judge fault category when dangerous warning circuit breaks down, therefore it can be improved the efficiency for checking dangerous warning circuit failure.
Description
Technical field
This application involves electronic circuit fields, in particular to a kind of dangerous alarm switch detection circuit.
Background technique
Accurately judge currently, not can be carried out in car body control module to the state of vehicle hazard warning circuit, especially
It cannot judge that the switch of vehicle hazard warning circuit is in malfunction and is in closed state, therefore when dangerous warning circuit
When being out of order, the failure can not be checked in time, lead to some unexpected generations.
Utility model content
In view of this, the application's is designed to provide a kind of dangerous alarm switch detection circuit, accurately to judge to endanger
The switch status of dangerous warning circuit and the efficiency for improving the dangerous warning circuit failure of investigation.
To achieve the goals above, embodiments herein is accomplished in that
In a first aspect, embodiments herein provides a kind of dangerous alarm switch detection circuit, it is applied to vehicle risk
Warning circuit, comprising: button switch, the first current limiting element, the second current limiting element, the first node of the button switch with it is described
The first terminal of first current limiting element connects, second Node connectedness of second current limiting element one end and the button switch,
The second current limiting element other end is connect with the Second terminal of first current limiting element；In the key of the button switch
When in the second state that the key is connect with first node and the second node, external detection device sends first
Detection electric current is inputted from second node, the first detection impedance and described second of the electric current through first current limiting element
The impedance of current limiting element jointly to it is described first detection current limitation and obtain the second detection electric current, it is described second detection electric current from
The Second terminal is output to the external detection device；The button switch key in the key and described the
When one node and/or the unconnected first state of the second node, the third that external detection device sends detects electric current from described
The input of second node, third detection impedance of the electric current through second current limiting element current limitation detected to the third and
The 4th detection electric current is obtained, the 4th detection electric current is output to the external detection device from the Second terminal.
In some optional embodiments of the application first aspect, the impedance stabilization of second current limiting element.
In some optional embodiments of the application first aspect, second current limiting element is fixed value resistance.
In some optional embodiments of the application first aspect, the second current limiting element resistance value is in 500-3000
Ohm.
In some optional embodiments of the application first aspect, second current limiting element is fixed carbon resister.
In some optional embodiments of the application first aspect, the Europe the first current limiting element resistance value 100-3000
Nurse.
In some optional embodiments of the application first aspect, second current limiting element is 820 ohm, described
First current limiting element is 820 ohm.
In some optional embodiments of the application first aspect, second current limiting element is 2500 ohm, described
First current limiting element is 500 ohm.
In some optional embodiments of the application first aspect, the button switch is reset button switch.
In some optional embodiments of the application first aspect, the reset button switch is short stroke reset button
Switch.
The beneficial effect of the application is:
In the embodiment of the present application, the first node of button switch is connect with the first terminal of the first current limiting element, the
The of second Node connectedness of two current limiting element one end and button switch, the other end of the second current limiting element and the first current limiting element
Two-terminal connection；By to the impedance from impedance and the second current limiting element through the first current limiting element after the transmission of external detection device
After common current limliting or by the detection electric current after the transmission of external detection device after the impedance current limliting of the second current limiting element
It is detected, realizes the judgement to the switch state of dangerous warning circuit, so as to when dangerous warning circuit breaks down
Timely and accurately judge fault category, therefore can be improved the efficiency for checking dangerous warning circuit failure.
To enable the above objects, features, and advantages of the application to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only some embodiments of the application, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 shows a kind of dangerous alarm switch detection circuit cooperation external detection dress of the application first embodiment offer
The structural block diagram set；
Fig. 2 shows a kind of structural block diagrams for dangerous alarm switch detection circuit that the application second embodiment provides；
Fig. 3 shows a kind of structural block diagram of dangerous alarm switch detection circuit of the application second embodiment offer；
Fig. 4 shows the structural block diagram of the second current limiting element of one kind of the application 3rd embodiment offer.
Icon: 10- danger alarm switch detection circuit；110- button switch；The first node of 111-；The second knot of 112-
Point；The first current limiting element of 120-；121- first terminal；122- Second terminal；The second current limiting element of 130-；131- first
Series resistance；The second series resistance of 132-.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Ground description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.Usually exist
The component of the embodiment of the present application described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause
This, is not intended to limit claimed the application's to the detailed description of the embodiments herein provided in the accompanying drawings below
Range, but it is merely representative of the selected embodiment of the application.Based on embodiments herein, those skilled in the art are not being done
Every other embodiment obtained under the premise of creative work out, shall fall in the protection scope of this application.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present application, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, or be somebody's turn to do
Product using when the orientation or positional relationship usually put, be merely for convenience of description the application and simplify description, without referring to
Show or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot manage
Solution is the limitation to the application.In addition, term " first ", " second ", " third " etc. are only used for distinguishing description, and should not be understood as
Indication or suggestion relative importance.
In addition, the terms such as term "horizontal", "vertical", " pendency " are not offered as requiring component abswolute level or pendency, and
It is that can be slightly tilted.It is not to indicate the structure if "horizontal" only refers to that its direction is more horizontal with respect to for "vertical"
It has to fully horizontally, but can be slightly tilted.
In the description of the present application, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State the concrete meaning of term in this application.
First embodiment
Below with reference to Fig. 1, in detail to each section of dangerous alarm switch detection circuit 10 provided in this embodiment into
Row explanation.
Referring to Fig. 1, Fig. 1 is that the dangerous alarm switch provided in this embodiment applied to vehicle risk warning circuit detects
Circuit 10 cooperates the structural block diagram of external detection device, and dangerous alarm switch detection circuit 10 includes: button switch 110, first
Current limiting element 120 and the second current limiting element 130.The first of first node 111 of button switch 110 and the first current limiting element 120
Terminal 121 connects, and one end of the second current limiting element 130 is connect with the second node 112 of button switch 110, the second current limiting element
130 other end is connect with the Second terminal 122 of the first current limiting element 120.
External detection device can be BCM controller mounted on a vehicle.BCM controller is for controlling body electric system system
System, is one of important component of automobile.The vital task of car body controller is simplified operation, reduces the manual behaviour of occupant
Make, in order to avoid the attention of dispersion occupant.Autobody control system includes automotive safety, pleasant climate and information communication system
System is mainly used for enhancing safety, comfort and the convenience of automobile.External detection device may be other kinds of carrying
The car body control module on vehicle, is not construed as limiting herein.
Button switch 110 has key, when should press key pressing, connects the first node 111 and the second node 112, can
Dangerous warning circuit is set to be in connected state.Button switch 110 can select reset button to switch, i.e., after pressing the key,
The key can voluntarily be returned to initial position, but change circuit connection state, make the first node 111 and the second knot
Point 112 is in connection status, and button switch 110 is closed state, presses the button again, changes the opening and closing shape of button switch 110
State.Button switch 110 can also select short stroke reset button to switch, and can easily do and press the button when needing key,
Change the open and-shut mode of button switch 110.
When button switch 110 is closure, external detection device can be sent out by the output end connecting with the second node 112
Send the first detection electric current, the first detection electric current input from the second node 112, first detect electric current flow through after button switch 110 from
The outflow of first node 111, the first terminal 121 through being attached thereto inputs, after flowing through the first current limiting element 120, from Second terminal
122 outflows；Meanwhile first detection electric current through the one end of the second current limiting element 130 being connected with the second node 112 flow through the second limit
Fluid element 130 is flowed out from the one end connecting with Second terminal 122.By the impedance of the first current limiting element 120 and the second current limliting member
The impedance of part 130 obtains the second detection electric current to the first detection current limitation jointly, the second detection electric current by with Second terminal
The receiving end of 122 connections returns to external detection device.When button switch 110 is to disconnect, in external detection device by with the
The third that the output end of two nodes 112 connection sends detects electric current, and third detection electric current is inputted from the second node 112, third detection
Electric current cannot detect current limitation to third by the circuit where the first current limiting element 120, and can only pass through the second current limliting member
Circuit where part 130 detects current limitation to third, i.e., third detection electric current is through the second current limiting element 130 and the second node
The second current limiting element 130 is flowed through in 112 connected one end, flows out from the one end connecting with Second terminal 122.By the second current limliting member
The impedance of part 130 obtains the 4th detection electric current to third detection current limitation, and the 4th detection electric current with Second terminal 122 by connecting
The receiving end connect returns to external detection device.
First detection electric current is identical as third detection size of current, and for convenience of describing, short-circuit condition and open circuit is described below
When the testing principle of state, all replaced with the first detection electric current.When being closed due to button switch 110 with disconnecting, the circuit of access
Difference, the impedance being consequently formed be not also identical.Assuming that the current value of the second detection electric current is A when button switch 110 is closed；
When button switch 110 disconnects, the current value of the 4th detection electric current is B；And in the route of dangerous alarm switch detection circuit 10
When short-circuit, since the first detection electric current directly can return to reception from the output end of external detection device by the route of short circuit
End, the current value of the second detection electric current is infinity at this time；And in the line broken circuit of dangerous alarm switch detection circuit 10, by
Receiving end cannot be returned to from the output end of external detection device in the first detection electric current, the current value of the second detection electric current is at this time
0.Therefore, external detection device can be connect by the current value size of the second detection electric current of detection or the 4th detection electric current, judgement
Enter the impedance ranges of circuit, to judge the state of vehicle risk warning circuit.
In the present embodiment, dangerous alarm switch detection circuit 10 can be accurately realized by above-mentioned principle and be endangered to vehicle
The state of dangerous warning circuit judges, so as to timely and accurately judge failure classes when dangerous warning circuit breaks down
Not, therefore it can be improved the efficiency for checking dangerous warning circuit failure.Event in case of emergency, can be also being judged as early as possible
Hinder classification, to faster make corresponding treatment measures.
In dangerous alarm switch detection circuit 10 provided in this embodiment, the impedance stabilization of the second current limiting element 130, energy
Enough when dangerous alarm switch detection circuit 10 detects the state of dangerous warning circuit, the second more stable detection electric current is provided
Or the 4th detection electric current current value, therefore more enough accurately judge dangerous warning circuit state in which.
In dangerous alarm switch detection circuit 10 provided in this embodiment, the second current limiting element 130 can be definite value electricity
Resistance, fixed value resistance are able to maintain that resistance value is relatively stable in range, so as to provide more stable the second detection electric current or
The current value of 4th detection electric current, therefore dangerous alarm switch detection circuit 10 can accurately judge dangerous warning circuit institute
The state at place.
In dangerous alarm switch detection circuit 10 provided in this embodiment, the second current limiting element 130 can be carbon film electricity
Resistance, or metalfilmresistor etc..Fixed value resistance can select resistivity and temperature, and almost unrelated material does conductor, with this
Temperature change is avoided to give resistance bring error as far as possible.Fixed value resistance can also select the definite value electricity for taking bifilar winding
Resistance, guarantees that resistance size is unrelated with electric current with this.It is of course also possible to the fixed value resistance for selecting other performances stable, according to
Actual conditions select different types of fixed value resistance, to adapt to actual conditions.Therefore, definite value cited in the present embodiment electricity
Type is hindered, the restriction to the application is not construed as.
Second embodiment
In dangerous alarm switch detection circuit 10 provided in this embodiment applied to vehicle risk warning circuit, it will tie
Attached drawing 2 and attached drawing 3 are closed, some clearer explanations are made to the impedance of the second current limiting element 130.And it external detection device, presses
The connection relationship of button switch 110, the first current limiting element 120 and the second current limiting element 130, is referred in first embodiment
Connection relationship, details are not described herein again.
Referring to Fig. 2, in the present embodiment, the resistance value of the first current limiting element 120 is 820 ohm, the second current limiting element 130
The fixed value resistance that also the same selection resistance value is 820 ohm.When button switch 110 is closed, the first current limiting element 120 and second
Current limiting element 130 is in parallel, ignores other factors bring minor impact, then the all-in resistance resistance value in circuit can be considered as at this time
410 ohm.Assuming that external detection device sets the critical field of judgement, and such as: alarm status: 25-35 milliamperes；It does not alert
State: 12-18 milliamperes；Short-circuit condition: greater than 500 milliampere；Off state: less than 1 milliampere is (it should be noted that the model set herein
Enclose to be set according to the actual situation, and non-stationary ranges value).Assuming that the voltage that external detection device provides is 12 volts
Spy falls in it and sets then the current value in the second detection electric current of external detection device receiving end detection is 29.3 milliamperes
Alarm status range in, determine that dangerous warning circuit is in alarm status.
When button switch 110 disconnects, the first current limiting element 120 does not access circuit, the access of only the second current limiting element 130
In circuit, then the all-in resistance resistance value in circuit can be considered as 820 ohm at this time.And the voltage that external detection device provides is 12
Volt falls in its setting then the current value in the 4th detection electric current of external detection device receiving end detection is 14.6 milliamperes
In the range of good non-alarm status, determine that dangerous warning circuit is in non-alarm status.
And when dangerous alarm switch detection circuit 10 has line short, the first current limiting element 120 and the second current limiting element
130 all do not tap into circuit, then the all-in resistance resistance value in circuit can be considered as 0 ohm at this time.And external detection device mentions
The voltage of confession is 12 volts, then the current value in the second detection electric current of external detection device receiving end detection is infinity,
It falls in the range for the short-circuit condition that it sets, determines that dangerous warning circuit is in short-circuit condition.
When 10 open circuit of dangerous alarm switch detection circuit, the first detection electric current that external detection device output end is sent without
Method passes through dangerous alarm switch detection circuit 10 and returns to external detection device receiving end, then examining in external detection device receiving end
The current value for the second detection electric current surveyed is 0 milliampere, is fallen in the range for the off state that it sets, and determines dangerous alarm electricity
Road is in off state.
Referring to Fig. 3, in the present embodiment, the resistance value of the first current limiting element 120 is 500 ohm, the second current limiting element 130
Selecting resistance value is 2500 ohm of fixed value resistance.When button switch 110 is closed, the first current limiting element 120 and the second current limliting member
Part 130 is in parallel, ignores other factors bring minor impact, then the all-in resistance resistance value in circuit can be considered as 416.7 at this time
Ohm.Assuming that external detection device sets the critical field of judgement, and such as: alarm status: 50-65 milliamperes；Shape is not alerted
State: 6-12 milliamperes；Short-circuit condition: greater than 500 milliampere；Off state: less than 1 milliampere.Assuming that external detection device provided
Voltage is 24 volts, then the current value in the second detection electric current of external detection device receiving end detection is 57.6 milliamperes, is fallen
In the range for the alarm status that it sets, determine that dangerous warning circuit is in alarm status.
When button switch 110 disconnects, the first current limiting element 120 does not access circuit, the access of only the second current limiting element 130
In circuit, then the all-in resistance resistance value in circuit can be considered as 2500 ohm at this time.And the voltage that external detection device provides is
24 volts, then the current value in the 4th detection electric current of external detection device receiving end detection is 9.6 milliamperes, fall in its setting
In the range of good non-alarm status, determine that dangerous warning circuit is in non-alarm status.
And when dangerous alarm switch detection circuit 10 has line short, the first current limiting element 120 and the second current limiting element
130 all do not tap into circuit, then the all-in resistance resistance value in circuit can be considered as 0 ohm at this time.And external detection device mentions
The voltage of confession is 24 volts, then the current value in the second detection electric current of external detection device receiving end detection is infinity,
It falls in the range for the short-circuit condition that it sets, determines that dangerous warning circuit is in short-circuit condition.
When 10 open circuit of dangerous alarm switch detection circuit, the first detection electric current that external detection device output end is sent without
Method passes through dangerous alarm switch detection circuit 10 and returns to external detection device receiving end, then examining in external detection device receiving end
The current value for the second detection electric current surveyed is 0 milliampere, is fallen in the range for the off state that it sets, and determines dangerous alarm electricity
Road is in off state.
In the present embodiment, by assigning different resistance values to the second current limiting element 130, dangerous alarm switch is detected
The state judgement of circuit 10 is illustrated., it can be seen that the resistance value of the second current limiting element 130 and the first current limiting element 120 whether there is or not
Difference can accurately judge the state of dangerous alarm switch detection circuit 10.It should be noted that a kind of feelings
Condition is, when the resistance value of the second current limiting element 130 is significantly less than the resistance value of the first current limiting element 120, for example, the first current limliting is first
The resistance value of part 120 is 1000 ohm, and the resistance value of the second current limiting element 130 is 100 ohm, and total resistance value when the two parallel connection is
90.9 ohm, the voltage that external detection device provides is 12 volts.When button switch 120 is closed, the electric current of the second detection electric current
Value is 132 milliamperes, and when button switch 120 disconnects, the current value of the 4th detection electric current is 120 milliamperes, then at this time, it is necessary to right
The detection accuracy of external detection device has some require.When the resistance value of the first current limiting element 120 is 10000 ohm, and second
The resistance value of current limiting element 130 is 50 ohm, and total resistance value when the two parallel connection is 49.75 ohm, the electricity that external detection device provides
Pressure is 12 volts.When button switch 120 is closed, the current value of the second detection electric current is 241 milliamperes, when button switch 120 disconnects,
The current value of 4th detection electric current is 240 milliamperes, and at this time, it is desirable to external detection device has very high detection accuracy.
3rd embodiment
Referring to Fig. 3, the dangerous alarm switch in the dangerous warning circuit provided in this embodiment applied to vehicle detects
In circuit 10, the second current limiting element 130 can be by two fixed value resistances: the first series resistance 131 and the second series resistance 132 into
It is obtained after row series connection, in other embodiments, or multiple fixed value resistances connect to obtain, and are not construed as herein to the application
Restriction.
First series resistance 131 and the second series resistance 132 are all fixed value resistance, guarantee that its resistance value is stablized, and are facilitated pair
The state of dangerous alarm switch detection circuit 10 is accurately judged.
In some actual applications, the Standard resistance range of dangerous 10 second current limiting element 130 of alarm switch detection circuit
The voltage that selection can be provided dependent on external control device.In order to guarantee the first series resistance 131 and the resistance of the second series resistance 132
The stabilization of value, can choose fixed carbon resister, and fixed carbon resister has the advantages that quality-high and inexpensive, and can satisfy civil standards.It will
It applies very suitable in the dangerous alarm switch detection circuit 10 of the dangerous warning circuit of vehicle.
In conclusion embodiments herein provides a kind of dangerous alarm switch detection circuit, it is applied to vehicle risk
Warning circuit, comprising: button switch, the first current limiting element, the second current limiting element, the first node of the button switch with it is described
The first terminal of first current limiting element connects, second Node connectedness of second current limiting element one end and the button switch,
The second current limiting element other end is connect with the Second terminal of first current limiting element；In the key of the button switch
When in the second state that the key is connect with first node and the second node, external detection device sends first
Detection electric current is inputted from second node, the first detection impedance and described second of the electric current through first current limiting element
The impedance of current limiting element jointly to it is described first detection current limitation and obtain the second detection electric current, it is described second detection electric current from
The Second terminal is output to the external detection device；The button switch key in the key and described the
When one node and/or the unconnected first state of the second node, the third that external detection device sends detects electric current from described
The input of second node, third detection impedance of the electric current through second current limiting element current limitation detected to the third and
The 4th detection electric current is obtained, the 4th detection electric current is output to the external detection device from the Second terminal.
By the way that the first node of button switch is connect with the first terminal of the first current limiting element, second current limiting element one end
With the second Node connectedness of button switch, the other end of the second current limiting element is connect with the Second terminal of the first current limiting element；It is logical
Cross to from external detection device transmission after after the impedance of the first current limiting element and the common current limliting of the impedance of the second current limiting element or
Person is realized by detecting to the detection electric current after the transmission of external detection device after the impedance current limliting of the second current limiting element
Judgement to the switch state of dangerous warning circuit, so as to timely and accurately judge when dangerous warning circuit breaks down
Be out of order classification, therefore can be improved the efficiency for checking dangerous warning circuit failure.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
1. a kind of danger alarm switch detection circuit, is applied to vehicle risk warning circuit characterized by comprising button is opened
Pass, the first current limiting element, the second current limiting element,
First node of the button switch is connect with the first terminal of first current limiting element, second current limiting element one
The second of second Node connectedness at end and the button switch, the second current limiting element other end and first current limiting element
Terminal connection；
In second in the key and first node and second Node connectedness of the key of the button switch
When state, external detection device sends the first detection electric current and inputs from second node, described in the first detection electric current warp
The impedance of first current limiting element and the impedance of second current limiting element obtain the to the first detection current limitation jointly
Two detection electric currents, the second detection electric current are output to the external detection device from the Second terminal；
The button switch key in the key and first node and/or second node it is unconnected
When first state, external detection device sends third detection electric current and inputs from second node, the third detection electric current warp
The impedance of second current limiting element detects current limitation to the third and obtains the 4th detection electric current, the 4th detection electricity
Stream is output to the external detection device from the Second terminal.
2. danger alarm switch detection circuit according to claim 1, which is characterized in that the resistance of second current limiting element
Anti- stabilization.
3. danger alarm switch detection circuit according to claim 2, which is characterized in that second current limiting element is fixed
It is worth resistance.
4. danger alarm switch detection circuit according to claim 3, which is characterized in that the second current limiting element resistance value
At 500-3000 ohm.
5. danger alarm switch detection circuit according to claim 4, which is characterized in that second current limiting element is carbon
Film resistance.
6. dangerous alarm switch detection circuit described in -5 any claims according to claim 1, which is characterized in that described first
100-3000 ohm of current limiting element resistance value.
7. danger alarm switch detection circuit according to claim 6, which is characterized in that second current limiting element is
820 ohm, first current limiting element is 820 ohm.
8. danger alarm switch detection circuit according to claim 6, which is characterized in that second current limiting element is
2500 ohm, first current limiting element is 500 ohm.
9. danger alarm switch detection circuit according to claim 6, which is characterized in that the button switch is to reset to press
Button switch.
10. danger alarm switch detection circuit according to claim 9, which is characterized in that the reset button, which switchs, is
Short stroke reset button switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821644838.4U CN209086399U (en) | 2018-10-09 | 2018-10-09 | A kind of danger alarm switch detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821644838.4U CN209086399U (en) | 2018-10-09 | 2018-10-09 | A kind of danger alarm switch detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209086399U true CN209086399U (en) | 2019-07-09 |
Family
ID=67118780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821644838.4U Expired - Fee Related CN209086399U (en) | 2018-10-09 | 2018-10-09 | A kind of danger alarm switch detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209086399U (en) |
-
2018
- 2018-10-09 CN CN201821644838.4U patent/CN209086399U/en not_active Expired - Fee Related
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