CN209105143U - Two line of normal open/normal close integral formula is close to switching circuit - Google Patents
Two line of normal open/normal close integral formula is close to switching circuit Download PDFInfo
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- CN209105143U CN209105143U CN201822232031.6U CN201822232031U CN209105143U CN 209105143 U CN209105143 U CN 209105143U CN 201822232031 U CN201822232031 U CN 201822232031U CN 209105143 U CN209105143 U CN 209105143U
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Abstract
A kind of two line of normal open/normal close integral formula disclosed in the utility model is close to switching circuit, including connecting line one and connecting line two；Rectification circuit；Constant-current drive circuit；Signal amplification circuit；Voltage regulator circuit；Normally-open normally-close conversion circuit；Signal deteching circuit；Connecting line one and connecting line two are connected with two input terminals of rectification circuit respectively, and the positive and negative anodes of rectification circuit are connected with constant-current drive circuit respectively, and constant-current drive circuit is connected with signal amplification circuit, and signal amplification circuit is connected with normally-open normally-close conversion circuit；Normally-open normally-close conversion circuit is connected with signal deteching circuit；The input terminal of voltage regulator circuit is connected on the connecting line that rectification circuit is connected with constant-current drive circuit, and two output ends are connected with normally-open normally-close conversion circuit and signal deteching circuit respectively.Its circuit structure promotion feeling answers speed and service life, and easy to use, and performance is stablized.
Description
Technical Field
The utility model belongs to the technical field of an inductive switch's technique and specifically relates to a two line proximity switch circuits of normally open normal close integral type.
Background
The proximity switch is widely applied to various automatic devices and is used for position detection when the devices run.
Currently, the existing proximity switches are classified into a passive type and an active type. The passive reed switch is basically used for sensing a magnetic field position signal, but the switch of the reed switch has mechanical action, so the response speed is slow, and meanwhile, the service life of a mechanical contact is short. The active is basically 3 or more, 2 of them are used for supplying power to the switch, and the other line is used for normally-open or normally-closed signal output, and the switch needs to provide a separate power supply in use at present, and the following defects exist in practical use:
1. because the existing automatic control system is basically composed of an electronic circuit, a common input interface is an optical coupling input circuit which is divided into a common negative input and a common positive input, if the existing 3-wire proximity switch is adopted, the output type of the switch needs to be specified during purchase, and the circuit cannot normally work due to the wrong output type of the switch.
2. Because the power line and the signal line exist in the 3 lines of the switch, if the wiring is wrong, the switch does not work if the wiring is light, and the switch is damaged if the wiring is heavy.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the not enough of above-mentioned technique and a promotion induction rate and life that designs, and convenient to use, stable performance's two line proximity switch circuits of normally open normal close integral type.
The utility model relates to a normally open two line proximity switch circuits of normal close integral type, include:
the first connecting line and the second connecting line;
the rectifying circuit is used for ensuring the correct polarity of the switch working circuit;
the constant current driving circuit enables the switch to work below the designed current all the time;
the signal amplification circuit is used for amplifying and indicating the signal output by the normally open and normally closed conversion circuit;
the voltage stabilizing circuit is used for providing stable voltage for the normally-open and normally-closed conversion circuit and the signal detection circuit;
the normally open and normally closed conversion circuit is used for automatically converting a normally open mode or a normally closed mode to the switching circuit;
and the signal detection circuit senses whether the detected object is in place by utilizing the magnetic resistance sensor chip of the signal detection circuit to output signals.
The first connecting wire and the second connecting wire are respectively connected with two input ends of the rectifying circuit, the positive pole and the negative pole of the rectifying circuit are respectively connected with the constant current driving circuit, the constant current driving circuit is connected with the signal amplifying circuit, and the signal amplifying circuit is connected with the normally open and normally closed conversion circuit; the normally open and normally closed conversion circuit is connected with the signal detection circuit; the input end of the voltage stabilizing circuit is connected with the output end of the rectifying circuit, and the two output ends of the voltage stabilizing circuit are respectively connected with the normally open and normally closed conversion circuit and the signal detection circuit.
Further preferably, the rectifier circuit employs a bridge rectifier V1 that ensures that the switch ensures the correct polarity of the operating circuit regardless of the polarity of the input dc power.
Further preferably, the overvoltage protection circuit is comprised of a self-recovery fuse FU1 and a schottky diode D3, which ensures that the switch will quickly cut off the power supply when the input voltage exceeds the designed maximum operating voltage, thereby protecting the circuit from damage, and in addition, when the switch is used directly to control an inductive load such as a relay, the schottky diode D3 acts as a freewheeling diode for absorbing the reverse pulse voltage.
Preferably, the constant current driving circuit comprises a triode T1, a triode T2, a resistor R2 and a resistor R4, and the circuit can ensure that the switch works below the designed current, prevent the switch from being damaged by overcurrent and protect the switch.
Further preferably, the signal amplification circuit is composed of a triode T3, a triode T4, a resistor R3, a resistor R5, a resistor R6 and a light emitting diode D2, and the circuit amplifies an output signal of the xor gate chip U2 or the xor gate chip U2 and then is used for controlling output control and indication of the proximity switch, and lighting indication is performed through the light emitting diode D2.
Preferably, the voltage stabilizing circuit is composed of a capacitor C1, a capacitor C2, a high-dropout ultra-low power consumption linear regulator U1 and a diode D1, only a few microamps of current are needed when the proximity switch is not conducted, so that the working state of the input port is not affected, and the diode D1 is used for enabling the switch to have a certain voltage drop in the circuit when the switch is conducted so as to ensure the normal operation of the voltage stabilizing circuit.
Further preferably, the first normally-on and normally-off switching circuit comprises a resistor R1, a diode D4, and an exclusive or gate chip U2; the cathode of the diode D4 is respectively connected with the second connecting wire and the rectifying circuit, and the anode of the diode D4 is connected with the second input end of the exclusive-OR gate chip U2; the input end I of the exclusive-OR gate chip U2 is connected with the signal detection circuit, and the output end thereof is connected with the signal amplification circuit; one end of the resistor R1 is connected with the second input end of the XOR gate chip U2, and the other end is connected with the output end of the voltage stabilizing circuit. Or,
the second normally-on normally-off switching circuit comprises a resistor R1, a diode D4 and an XOR gate chip U2; the cathode of the diode D4 is respectively connected with the second connecting wire and the rectifying circuit, and the anode of the diode D4 is connected with the second input end of the XOR gate chip U2; the input end I of the exclusive-OR gate chip U2 is connected with the signal detection circuit, and the output end thereof is connected with the signal amplification circuit; one end of the resistor R1 is connected with the second input end of the XOR gate chip U2, and the other end of the resistor R1 is connected with the output end of the voltage stabilizing circuit; the second circuit is opposite to the normally open and normally closed state of the first circuit.
The normally open and normally closed conversion circuit solves the problem of universality of the switch better, so that a client does not need to designate the output type of the switch during purchasing, and normally open and normally closed state conversion can be realized only by simply exchanging the first connecting line and the second connecting line in different use occasions.
Further preferably, the third normally-open and normally-closed conversion circuit comprises a resistor R1, a resistor R7 and an xor gate chip U2, wherein the xor gate chip U2 is selectively provided with a resistor R1 or a resistor R7 to perform normally-open or normally-closed conversion; or
The fourth normally-open and normally-closed conversion circuit comprises a resistor R1, a resistor R7 and an XOR gate chip U2, wherein a resistor R1 or a resistor R7 are selectively installed at the second input end of the XOR gate chip U2 to perform normally-open or normally-closed conversion.
Preferably, the normally open and normally closed conversion circuit, the signal detection circuit and the voltage stabilizing circuit are respectively formed by a plurality of low-power electronic elements. The problem of prior art's active proximity switch need provide the power alone is solved, can directly replace passive proximity switch and use and need not to change the circuit for it is fairly convenient reliable to use.
Further preferably, the signal detection circuit comprises a magnetoresistive sensor chip U3 and a capacitor C3; the first pin of the magnetoresistive sensor chip U3 and one end of the capacitor C3 are connected with the output end of the voltage stabilizing circuit, the third pin of the magnetoresistive sensor chip is connected with the other end of the capacitor in a grounding mode, and the second pin of the magnetoresistive sensor chip is connected with the first input end of the exclusive-OR gate chip U2 or the first input end of the exclusive-OR gate chip U2.
The utility model relates to a normally open normally closed integral two-wire proximity switch circuit, the structure of which adopts chip type magnetic field induction detection, so that the reaction speed of the proximity switch is improved; and the two-wire connection and normally open and normally closed conversion circuit can ensure that the normal connection or the reverse connection can work normally, thereby avoiding the occurrence of the condition of switch damage caused by wrong connection, ensuring that the connection of the proximity switch is simple and reliable, and having better general performance.
In addition, the proximity switch circuit is composed of low-power-consumption electronic elements, so that the self power consumption is extremely low, the static power consumption is about 5uA, the proximity switch circuit is directly connected in the port circuit in series during working, the switch is directly powered from the port due to the extremely low power consumption, the state of the port is not influenced, and the proximity switch circuit has no influence on a control circuit and has no extra power consumption.
Drawings
FIG. 1 is a block diagram of the circuit configuration of embodiment 1;
FIG. 2 is a schematic circuit diagram of embodiment 1;
fig. 3 is a schematic circuit diagram of the fixed normally-open mode of embodiment 2;
fig. 4 is a schematic circuit diagram of a fixed normally-off mode of embodiment 2.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.
Example 1:
as shown in fig. 1 and fig. 2, the normally open and normally closed integrated two-wire proximity switch circuit described in this embodiment includes a first connection wire, a second connection wire, a rectifier circuit 1, an overvoltage protection circuit 2, a constant current driving circuit 3, a signal amplification circuit 4, a normally open and normally closed circuit 5, a signal detection circuit 6, and a voltage stabilizing circuit 7 for stabilizing voltage when each circuit operates; the first connecting wire and the second connecting wire are respectively connected with two input ends of the rectifying circuit 1, the positive pole and the negative pole of the rectifying circuit 1 are respectively connected with the constant current driving circuit 3, the constant current driving circuit 3 is connected with the signal amplifying circuit 4, and the signal amplifying circuit 4 is connected with the normally open and normally closed conversion circuit 5; the normally open and normally closed conversion circuit 5 is connected with the signal detection circuit 6; the input end of the voltage stabilizing circuit 7 is connected with the output end of the rectifying circuit 1, and the two output ends of the voltage stabilizing circuit are respectively connected with the normally open and normally closed conversion circuit 5 and the signal detection circuit 6.
In the embodiment, the rectifying circuit 1 ensures the correct polarity of the switch working circuit; the rectifying circuit adopts a rectifier bridge stack V1, which ensures that the switch can ensure the correct polarity of the working circuit no matter what the polarity of the input direct current is; two input ends of the rectifier bridge stack V1 are respectively connected with the first connecting wire and the second connecting wire, and the anode and the cathode of the rectifier bridge stack V1 are connected with an internal circuit to form a loop of the proximity switch circuit.
In the embodiment, the overvoltage protection circuit 2 ensures that the switch quickly cuts off the power supply when the input voltage exceeds the designed highest working voltage; the circuit of the self-recovery fuse FU comprises a self-recovery fuse FU1 and a Schottky diode D3, wherein the self-recovery fuse FU1 is connected in series with the anode of a rectifier bridge stack V1; two ends of the schottky diode D3 are respectively connected to the positive and negative connection wires of the power supply, and are connected to the negative electrode of the rectifier bridge stack V1 and one end of the self-recovery fuse FU 1. The circuit can ensure that the switch can cut off the power supply quickly when the input voltage exceeds the designed maximum working voltage, thereby protecting the circuit from being damaged, and in addition, when the switch is directly used for controlling inductive loads such as a relay, the Schottky diode D3 is equivalent to a freewheeling diode and is used for absorbing reverse pulse voltage.
In this embodiment, the constant current driving circuit 3 makes the current always operate below the design current; the circuit of the circuit consists of a triode T1, a triode T2, a resistor R2 and a resistor R4, wherein a collector of the triode T1 is lapped on a positive pole connecting wire of a rectifier bridge stack V1 through a diode D1 of a voltage stabilizing circuit, and the diode D1 is connected with one end of a Schottky diode D3 and one end of a resistor R2; the base electrode of the triode T1 is respectively connected with the other end of the resistor R2 and the collector electrode of the triode T2, and the emitter electrode of the triode T1 is respectively connected with the base electrode of the triode T2 and one end of the resistor R4; the emitter of the triode T2 is respectively connected with the other end of the resistor R4 and the emitter of the triode T4 of the signal amplifying circuit; the collector of the triode T4 is lapped on the negative pole outgoing connecting wire of the rectifier bridge stack V1 and is connected with the Schottky diode D3; the circuit can ensure that the switch works below the design current, prevent the switch from being damaged by overcurrent and protect the switch.
In this embodiment, the signal amplification circuit 4 amplifies and indicates a signal output by the normally open and normally closed conversion circuit 5; the circuit of the LED lamp comprises a triode T3, a triode T4, a resistor R3, a resistor R5, a resistor R6 and a light-emitting diode D2, wherein a collector of the triode T3, the resistor R3 and the light-emitting diode D2 are connected in series; the light-emitting diode D2 is lapped on the positive pole outgoing connecting wire of the rectifier bridge stack V1 and is connected with the diode D1; an emitter of the triode T3 is connected with a connecting wire connected with the negative electrode of the rectifier bridge stack V1, a base of the triode T3 is connected with a connecting wire between the resistor R5 and the resistor R6, and the resistor R5 is connected with a normally-open normally-closed conversion circuit; the resistor R6 is connected with a negative electrode connecting wire of the rectifier bridge stack V1; the base electrode of the triode T4 is connected between the collector electrode of the triode T3 and the resistor R3; an emitter of the triode T3 is lapped on a negative electrode connecting wire of the rectifier bridge stack V1 and is connected with a collector of the triode T4; the circuit amplifies output signals of the XOR gate chip U2 or the XOR gate chip U2 and then is used for controlling output control and indication of the proximity switch, and light-up indication is carried out through the light-emitting diode D2.
In this embodiment, the voltage stabilizing circuit 5 stabilizes the voltage at which each circuit operates. The circuit of the circuit consists of a capacitor C1, a capacitor C2, a high-voltage-difference ultra-low-power-consumption linear voltage stabilizer U1 and a diode D1, wherein two ends of the capacitor C2 are respectively lapped on a negative pole connecting line and a positive pole connecting line of a rectifier bridge stack V1, one end of the capacitor C2 is respectively connected with a negative pole of the rectifier bridge stack V1 and a negative pole of a Schottky diode D3, and the other end of the capacitor C2 is respectively connected with a self-recovery fuse FU1 and a positive pole of a Schottky diode D3; the capacitor C1 and the linear voltage stabilizer U1 are connected in parallel and then are installed on a positive electrode connecting wire of the rectifier bridge stack V1, and the capacitor C1 is connected with the light-emitting diode D2 and the diode D1 respectively; the output terminal of the linear voltage regulator U1 is connected to the power supply pin 5 of the xor gate chip U2 or the xor gate chip U2 and the power supply pin 1 of the detection chip U3. The circuit only needs a few microamperes of current when the proximity switch is not conducted, so that the working state of the input port is not influenced, and the diode D1 has the function of enabling the switch to have certain voltage drop in the circuit when the switch is conducted so as to ensure the normal work of the voltage stabilizing circuit.
In this embodiment, the normally open and normally closed conversion circuit 5 completes the conversion of the normally open or normally closed mode to the switching circuit;
the first circuit structure comprises a resistor R1, a diode D4 and an exclusive-OR gate chip U2; the cathode of the diode D4 is respectively connected with the second connecting wire and the rectifying circuit, and the anode of the diode D4 is connected with the second input end of the exclusive-OR gate chip U2; the input end I of the exclusive-OR gate chip U2 is connected with the signal detection circuit, and the output end thereof is connected with the signal amplification circuit; one end of the resistor R1 is connected with the second input end of the XOR gate chip U2, and the other end is connected with the output end of the voltage stabilizing circuit. Or,
the second circuit structure comprises a resistor R1, a diode D4 and an exclusive-nor chip U2; the cathode of the diode D4 is respectively connected with the second connecting wire and the rectifying circuit, and the anode of the diode D4 is connected with the second input end of the XOR gate chip U2; the input end I of the exclusive-OR gate chip U2 is connected with the signal detection circuit, and the output end thereof is connected with the signal amplification circuit; one end of the resistor R1 is connected with the second input end of the XOR gate chip U2, and the other end is connected with the output end of the voltage stabilizing circuit.
When the circuit structure realizes positive connection (a first lead anode and a second lead cathode): the switch is in a normally closed mode under the condition of no magnetic field, and the switch is in a connected state; the switch is in an off state in the presence of a magnetic field. When reversely connected (negative wire one, positive wire two): the switch is in a normally open mode under the condition of no magnetic field, and is in a disconnected state; the switch is in a switch-on state under the condition of a magnetic field; and the second circuit structure is opposite to the normally open and normally closed state of the first circuit. The forward connection or the reverse connection can be carried out according to the actual use condition, so that the normally open or normally closed conversion is achieved, the use is quite convenient and reliable, and the use performance is better; the control of the output type can be achieved only by forward connection and reverse connection without purchasing according to the output type. The second circuit is opposite to the normally open and normally closed state of the first circuit.
In this embodiment, the signal detection circuit 6 senses whether the object to be detected is in place by using the magnetic resistance sensor chip thereof to output a signal; the sensor comprises a magnetoresistive sensor chip U3 and a capacitor C3; the first pin (Vin end) of the magnetoresistive sensor chip U3 is further connected to one end of the capacitor C3 and then connected to the output end of the voltage stabilizing circuit, the third pin (GND end) thereof and the other end of the capacitor C3 are connected and then connected to ground, and the second pin (out end) thereof is connected to the first input end of the xor gate chip U2 or the first input end of the xor gate chip U2.
In this embodiment, the normally open and normally closed conversion circuit, the signal detection circuit, and the voltage stabilizing circuit are respectively formed by a plurality of low power consumption electronic components. The problem of prior art's active proximity switch need provide the power alone is solved, can directly replace passive proximity switch and use and need not to change the circuit for it is fairly convenient reliable to use.
Example 2:
as shown in fig. 3 and 4, the general structure of the normally open and normally closed integrated two-wire proximity switch circuit described in this embodiment is the same as that of embodiment 1, but is different from that of embodiment 1: the third normally-open and normally-closed conversion circuit comprises a resistor R1, a resistor R7 and an XOR gate chip U2, wherein the XOR gate chip U2 is selectively provided with a resistor R1 or a resistor R7 to perform normally-open or normally-closed conversion; or
The fourth normally-open and normally-closed conversion circuit comprises a resistor R1, a resistor R7 and an XOR gate chip U2, wherein a resistor R1 or a resistor R7 are selectively installed at the second input end of the XOR gate chip U2 to perform normally-open or normally-closed conversion.
When the resistor R1 is selected, the constant normal open mode is adopted; a fixed normally-closed mode is adopted when the resistor R7 is selected; when the switch is fixed in a normally open mode or a normally closed mode, the installation of a positive electrode and a negative electrode is not distinguished, the common end and the corresponding control port of the control circuit are directly accessed, the wiring is simpler, and the universality is better. The normally open or normally closed conversion can be realized only by selectively installing the resistor, the anode and the cathode are not distinguished, the selective installation can be carried out by adopting short wires, micro switches or quick connectors and the like, and a fixed mode can also be adopted.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.
Claims (8)
1. A normally open normally closed integrated two-wire proximity switch circuit, comprising:
the first connecting line and the second connecting line;
the rectifying circuit is used for ensuring the correct polarity of the switch working circuit;
the constant current driving circuit enables the switch to work below the designed current all the time;
the signal amplification circuit is used for amplifying and indicating the signal output by the normally open and normally closed conversion circuit;
the voltage stabilizing circuit is used for providing stable voltage for the normally-open and normally-closed conversion circuit and the signal detection circuit;
the normally open and normally closed conversion circuit is used for automatically converting a normally open mode or a normally closed mode to the switching circuit;
the signal detection circuit senses whether the detected object is in place by utilizing the magnetic resistance sensor chip of the signal detection circuit to output signals;
the first connecting wire and the second connecting wire are respectively connected with two input ends of the rectifying circuit, the positive pole and the negative pole of the rectifying circuit are respectively connected with the constant current driving circuit, the constant current driving circuit is connected with the signal amplifying circuit, and the signal amplifying circuit is connected with the normally open and normally closed conversion circuit; the normally open and normally closed conversion circuit is connected with the signal detection circuit; the input end of the voltage stabilizing circuit is connected with the output end of the rectifying circuit, and the two output ends of the voltage stabilizing circuit are respectively connected with the normally open and normally closed conversion circuit and the signal detection circuit.
2. A normally open, normally closed, integral two wire proximity switch circuit according to claim 1, further comprising: the overvoltage protection circuit ensures that the switch quickly cuts off the power supply when the input voltage exceeds the designed highest working voltage, and is connected between the rectification circuit and the constant current circuit, and the input end of the voltage stabilizing circuit is connected to a connecting line connecting the overvoltage protection circuit and the constant current driving circuit.
3. The normally open normally closed integrated two-wire proximity switch circuit according to claim 1, wherein the normally open normally closed conversion circuit comprises a resistor R1, a diode D4, and an xor gate chip U2; the cathode of the diode D4 is respectively connected with the second connecting wire and the rectifying circuit, and the anode of the diode D4 is connected with the second input end of the exclusive-OR gate chip U2; the input end I of the exclusive-OR gate chip U2 is connected with the signal detection circuit, and the output end thereof is connected with the signal amplification circuit; one end of the resistor R1 is connected with the second input end of the XOR gate chip U2, and the other end is connected with the output end of the voltage stabilizing circuit.
4. The normally open normally closed integrated two-wire proximity switch circuit according to claim 1, wherein the normally open normally closed conversion circuit comprises a resistor R1, a diode D4, and an XOR gate chip U2; the cathode of the diode D4 is respectively connected with the second connecting wire and the rectifying circuit, and the anode of the diode D4 is connected with the second input end of the XOR gate chip U2; the input end I of the exclusive-OR gate chip U2 is connected with the signal detection circuit, and the output end thereof is connected with the signal amplification circuit; one end of the resistor R1 is connected with the second input end of the XOR gate chip U2, and the other end is connected with the output end of the voltage stabilizing circuit.
5. The normally-open normally-closed integrated two-wire proximity switch circuit according to claim 1, wherein the normally-open normally-closed conversion circuit comprises a resistor R1, a resistor R7 and an XOR gate chip U2, and a resistor R1 or a resistor R7 is selectively mounted at the input end of the XOR gate chip U2 to perform normally-open or normally-closed conversion.
6. The normally-open normally-closed integrated two-wire proximity switch circuit according to claim 1, wherein the normally-open normally-closed conversion circuit comprises a resistor R1, a resistor R7 and an XOR gate chip U2, and a resistor R1 or a resistor R7 is selectively mounted at an input end of the XOR gate chip U2 to perform normally-open or normally-closed conversion.
7. A normally open and normally closed integrated two-wire proximity switch circuit according to claim 3, 4, 5 or 6, characterized in that each of the normally open and normally closed conversion circuit, the signal detection circuit and the voltage stabilizing circuit is composed of a plurality of low power consumption electronic components.
8. The normally open and normally closed integrated two-wire proximity switch circuit according to claim 3, 4, 5 or 6, wherein the signal detection circuit comprises a magnetoresistive sensor chip U3 and a capacitor C3; the first pin of the magnetoresistive sensor chip U3 and one end of the capacitor C3 are connected with the output end of the voltage stabilizing circuit, the third pin of the magnetoresistive sensor chip is connected with the other end of the capacitor in a grounding mode, and the second pin of the magnetoresistive sensor chip is connected with the first input end of the exclusive-OR gate chip U2 or the first input end of the exclusive-OR gate chip U2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822232031.6U CN209105143U (en) | 2018-12-28 | 2018-12-28 | Two line of normal open/normal close integral formula is close to switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822232031.6U CN209105143U (en) | 2018-12-28 | 2018-12-28 | Two line of normal open/normal close integral formula is close to switching circuit |
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| Publication Number | Publication Date |
|---|---|
| CN209105143U true CN209105143U (en) | 2019-07-12 |
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| CN201822232031.6U Active CN209105143U (en) | 2018-12-28 | 2018-12-28 | Two line of normal open/normal close integral formula is close to switching circuit |
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