CN213547491U - Signal input circuit and signal input device that sensor was used - Google Patents
Signal input circuit and signal input device that sensor was used Download PDFInfo
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- CN213547491U CN213547491U CN202021617780.1U CN202021617780U CN213547491U CN 213547491 U CN213547491 U CN 213547491U CN 202021617780 U CN202021617780 U CN 202021617780U CN 213547491 U CN213547491 U CN 213547491U
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Abstract
The utility model belongs to the technical field of the sensor, concretely relates to signal input circuit and signal input device that sensor was used, including bridge rectifier and opto-coupler, bridge rectifier includes first input, the second input, the anodal and the direct current output negative pole of direct current output, first input is used for switching the signal line of connecting NPN type sensor or the power negative pole of PNP type sensor, the second input is used for switching the anodal signal line of connecting the anodal or PNP type sensor of power of NPN type sensor, the anodal positive input of opto-coupler is connected to the direct current output positive pole, the negative pole input of opto-coupler is connected to the direct current output negative pole, the collecting electrode of opto-coupler is connected with the power end, the projecting pole of opto-coupler is used for connection director's signal input part. The utility model discloses the signal input that can compatible NPN and PNP type sensor helps reducing the cost of sensor.
Description
Technical Field
The utility model belongs to the technical field of the sensor, concretely relates to signal input circuit and signal input device that sensor was used.
Background
The sensor is used as an information collecting device widely used in the field of industrial automation, and the accuracy of the information source of equipment is ensured. The data collected by the sensor is received by the controller and corresponding decision is made, so that automatic control is realized. Sensors can be classified into NPN and PNP types.
However, the inventor finds that the existing scheme has at least the following defects: the circuit for receiving signals can only be compatible with one type of sensor, and if the circuit is suitable for the two types of sensors, a relay is needed to convert the signals into PNP or NPN signals to be received by the controller, so that inconvenience is brought to users.
SUMMERY OF THE UTILITY MODEL
One of the purposes of the utility model lies in: aiming at the defects of the prior art, the signal input circuit for the sensor is provided, can be compatible with the signal input of an NPN type sensor and a PNP type sensor, and is beneficial to reducing the cost of the sensor.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a signal INPUT circuit that sensor was used, includes bridge rectifier and opto-coupler, bridge rectifier includes first INPUT, second INPUT, the anodal and the direct current output negative pole of direct current output, first INPUT is used for switching the signal line of connecting NPN type sensor or the power negative pole of PNP type sensor, the second INPUT is used for switching the anodal or the signal line of PNP type sensor of the power of connecting NPN type sensor, the anodal connection of direct current output the anodal INPUT of opto-coupler, the direct current output negative pole is connected the negative pole INPUT of opto-coupler, the collecting electrode of opto-coupler is connected with the power end, the projecting pole of opto-coupler is used for the signal INPUT INPUT of connection director.
As an improvement on a signal input circuit for a sensor, the direct current output positive pole with be connected with first resistance R1 between the positive input of opto-coupler.
As an improvement of the signal input circuit for a sensor of the present invention, the signal transmission circuit further includes a second resistor R2, and the emitter of the optocoupler is connected to the ground through the second resistor R2.
As an improvement of the signal input circuit for the sensor, when the sensor is a PNP type, the first input end and the second input end are connected to form a loop with the signal line of the sensor and the power negative electrode.
As an improvement of the signal input circuit for the sensor of the present invention, when the sensor is an NPN type, the first input terminal and the second input terminal are connected to form a loop with the signal line of the sensor and the positive electrode of the power supply.
As an improvement of the signal input circuit for a sensor of the present invention, the model of the bridge rectifier is MB 10S.
As an improvement of the signal input circuit for a sensor of the present invention, the type of the optical coupler is EL 817.
As an improvement of the signal input circuit for the sensor of the present invention, the resistance of the first resistor R1 is 510 Ω, and the resistance of the second resistor R2 is 4.7K Ω.
A second object of the present invention is to provide a signal input device, including NPN type sensor and as above-mentioned signal transmission circuit, the signal line of NPN type sensor is connected the first input of bridge rectifier, the positive connection of power of NPN type sensor the second input of bridge rectifier.
The third object of the utility model is to provide a signal input device, reach like above-mentioned signal transmission circuit including PNP type sensor, the signal line of PNP type sensor is connected the second input of bridge rectifier, the power negative pole of PNP type sensor is connected to the first input of bridge rectifier.
The beneficial effects of the utility model reside in that, the utility model discloses a bridge rectifier and opto-coupler, bridge rectifier includes first INPUT, second INPUT, the anodal and the direct current output negative pole of direct current output, first INPUT is used for switching over the signal line of connecting NPN type sensor or the power negative pole of PNP type sensor, the second INPUT is used for switching over the anodal signal line of connecting NPN type sensor's power or PNP type sensor, the anodal connection of direct current output the anodal INPUT of opto-coupler, the direct current output negative pole is connected the negative pole INPUT of opto-coupler, the collecting electrode of opto-coupler is connected with the power end, the projecting pole of opto-coupler is used for connection director's signal INPUT part INPUT. Because the existing circuit for receiving signals can only be compatible with one type of sensor, if the existing circuit is suitable for the two types of sensors at the same time, a relay is needed to convert the signals into PNP or NPN signals to be received by the controller, and inconvenience is brought to users, therefore, a first input end is used for switching and connecting a signal line of an NPN type sensor or a negative electrode of a power supply of the PNP type sensor, a second input end is used for switching and connecting a positive electrode of the power supply of the NPN type sensor or the signal line of the PNP type sensor, when the sensor is the NPN type sensor, the signal line of the NPN type sensor is connected to the second input end of a bridge rectifier, the power supply of the NPN type sensor is connected to the first input end of the bridge rectifier, at the moment, the two input ends are respectively connected with the signal line of the NPN type sensor and the positive electrode of the power supply, the circuit is connected, the optocoupler is directly activated, the collector and the emitter of the optocoupler are conducted, and the level of an INPUT pin connected with an external controller is changed from low to high, so that signal transmission is completed; when the sensor is a PNP sensor, a signal wire of the PNP sensor is connected to a first INPUT end of a bridge rectifier, a power supply cathode of the PNP sensor is connected to a second INPUT end of the bridge rectifier, at the moment, the two INPUT ends are respectively connected with the signal wire of the PNP sensor and the power supply cathode to form a loop, when the PNP sensor outputs signals, the signal wire is high level, the loop is connected, an optocoupler is directly activated, a collector and an emitter of the optocoupler are connected, and the level of an INPUT pin connected with an external controller is changed from low to high, so that signal transmission is completed; the bridge rectifier is a device formed by connecting and packaging four rectifier diodes into a whole in the form of a bridge full-wave rectifier circuit, the optocoupler uses light as a medium to transmit an electric signal, usually, a light emitter, such as an infrared Light Emitting Diode (LED), and a light receiver, such as a photosensitive semiconductor tube and a photosensitive resistor are packaged in the same tube shell, when an input end is electrified with a signal, the light emitter emits light, and the light receiver generates photocurrent after receiving the light and flows out from an output end, so that 'electricity-light-electricity' conversion is realized. The utility model discloses the signal input that can compatible NPN and PNP type sensor helps reducing the cost of sensor.
Drawings
Fig. 1 is a schematic diagram of a connection between a signal transmission circuit and an NPN-type sensor according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of the connection between the signal transmission circuit and the PNP sensor according to embodiment 1 of the present invention.
Wherein: 10-bridge rectifier; 20-an optocoupler; 11-a first input; 12-a second input; 13-direct current output positive pole; 14-direct current output cathode; 21-positive input; 22-negative input; 23-a collector electrode; 24-emitter.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal "and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to fig. 1 to 2, but the present invention is not limited thereto.
Embodiment mode 1
A signal INPUT circuit for a sensor comprises a bridge rectifier 10 and an optocoupler 20, wherein the bridge rectifier 10 comprises a first INPUT end 11, a second INPUT end 12, a direct current output anode 13 and a direct current output cathode 14, the first INPUT end 11 is used for being switched and connected with a signal wire of an NPN type sensor or a power supply cathode of a PNP type sensor, the second INPUT end 12 is used for being switched and connected with a signal wire of a power supply anode of the NPN type sensor or a signal wire of the PNP type sensor, the direct current output anode 13 is connected with an anode INPUT end 21 of the optocoupler 20, the direct current output cathode 14 is connected with a cathode INPUT end 22 of the optocoupler 20, a collector 23 of the optocoupler 20 is connected with a power supply end, and an emitter 24 of the optocoupler 20 is used for being connected with a signal INPUT end INPUT. Because the existing circuit for receiving signals can only be compatible with one type of sensor, if the existing circuit is suitable for the two types of sensors at the same time, the signals need to be converted into PNP or NPN signals by using a relay to be received by the controller, and the use is inconvenient for users, therefore, a first input end 11 is used for switching and connecting a signal line of the NPN type sensor or a power supply cathode of the PNP type sensor, a second input end 12 is used for switching and connecting a power supply anode of the NPN type sensor or a signal line of the PNP type sensor, when the sensor is the NPN type sensor, the signal line of the NPN type sensor is connected to the second input end 12 of the bridge rectifier 10, the power supply anode of the NPN type sensor is connected to the first input end 11 of the bridge rectifier 10, at this time, two input ends are respectively connected with the signal line of the NPN type sensor and the power supply anode to form a loop, when the NPN, when the loop is switched on, the optical coupler 20 is directly activated, the collector 23 and the emitter 24 of the optical coupler 20 are conducted, and the level of an INPUT pin connected with an external controller is changed from low to high, so that signal transmission is completed; when the sensor is a PNP sensor, a signal line of the PNP sensor is connected to the first INPUT end 11 of the bridge rectifier 10, a power supply cathode of the PNP sensor is connected to the second INPUT end 12 of the bridge rectifier 10, at this time, the two INPUT ends are respectively connected with the signal line and the power supply cathode of the PNP sensor to form a loop, when the PNP sensor has a signal output, the signal line is at a high level, the loop is switched on, the optocoupler 20 is directly activated, the collector 23 and the emitter 24 of the optocoupler 20 are switched on, and the level of an INPUT pin connected with an external controller is changed from low to high, so that signal transmission is completed; the bridge rectifier 10 is a device formed by connecting and packaging four rectifier diodes into a whole in the form of a bridge full-wave rectifier circuit, the optocoupler 20 is a device for transmitting electric signals by taking light as a medium, and generally, a light emitter, such as an infrared Light Emitting Diode (LED), and a light receiver, such as a photosensitive semiconductor tube and a photosensitive resistor, are packaged in the same tube shell, when an input end is powered up with a signal, the light emitter emits light, and the light receiver generates photocurrent after receiving the light and flows out from an output end, so that 'electricity-light-electricity' conversion is realized.
In the present embodiment, the bridge rectifier 10 is a device formed by connecting and packaging four rectifier diodes (D1, D2, D3, D4) in a form of a bridge full-wave rectifier circuit, wherein the first input terminal 11 and the second input terminal 12 are usually ac input terminals, the first input terminal 11 is located between D1 and D4, the second input terminal 12 is located between D2 and D3, the dc output positive electrode 13 is located between D1 and D2, and the dc output negative electrode 14 is located between D3 and D4.
Preferably, a first resistor R1 is connected between the positive dc output electrode 13 and the positive input end 21 of the optocoupler 20. The first resistor R1 has the function of limiting large current, avoids burnout of the optocoupler 20, and is beneficial to prolonging the service life of the signal transmission circuit.
Preferably, the signal transmission circuit further includes a second resistor R2, and the emitter 24 of the optocoupler 20 is grounded through the second resistor R2.
Preferably, when the sensor is a PNP type, the first input terminal 11 and the second input terminal 12 are connected to a signal line of the sensor and a negative electrode of a power supply to form a loop; when the sensor is of NPN type, the first input terminal 11 and the second input terminal 12 are connected to the signal line of the sensor and the positive electrode of the power supply to form a loop.
The utility model discloses a theory of operation is:
because the existing circuit for receiving signals can only be compatible with one type of sensor, if the existing circuit is suitable for the two types of sensors at the same time, the signals need to be converted into PNP or NPN signals by using a relay to be received by the controller, and the use is inconvenient for users, therefore, a first input end 11 is used for switching and connecting a signal line of the NPN type sensor or a power supply cathode of the PNP type sensor, a second input end 12 is used for switching and connecting a power supply anode of the NPN type sensor or a signal line of the PNP type sensor, when the sensor is the NPN type sensor, the signal line of the NPN type sensor is connected to the second input end 12 of the bridge rectifier 10, the power supply anode of the NPN type sensor is connected to the first input end 11 of the bridge rectifier 10, at this time, two input ends are respectively connected with the signal line of the NPN type sensor and the power supply anode to form a loop, when the NPN, when the loop is switched on, the optical coupler 20 is directly activated, the collector 23 and the emitter 24 of the optical coupler 20 are conducted, and the level of an INPUT pin connected with an external controller is changed from low to high, so that signal transmission is completed; when the sensor is a PNP sensor, a signal line of the PNP sensor is connected to the first INPUT end 11 of the bridge rectifier 10, a power supply cathode of the PNP sensor is connected to the second INPUT end 12 of the bridge rectifier 10, at this time, the two INPUT ends are respectively connected with the signal line and the power supply cathode of the PNP sensor to form a loop, when the PNP sensor has a signal output, the signal line is at a high level, the loop is switched on, the optocoupler 20 is directly activated, the collector 23 and the emitter 24 of the optocoupler 20 are switched on, and the level of an INPUT pin connected with an external controller is changed from low to high, so that signal transmission is completed; the bridge rectifier 10 is a device formed by connecting and packaging four rectifier diodes into a whole in the form of a bridge full-wave rectifier circuit, the optocoupler 20 is a device for transmitting electric signals by taking light as a medium, and generally, a light emitter, such as an infrared Light Emitting Diode (LED), and a light receiver, such as a photosensitive semiconductor tube and a photosensitive resistor, are packaged in the same tube shell, when an input end is powered up with a signal, the light emitter emits light, and the light receiver generates photocurrent after receiving the light and flows out from an output end, so that 'electricity-light-electricity' conversion is realized.
The signal transmission circuit is connected with different types of sensors through the bridge rectifier 10, can be compatible with the access and signal transmission of NPN and PNP type sensors at the same time, and has simple principle and low cost.
Embodiment mode 2
The difference from embodiment mode 1 is: in this embodiment, the resistance of the first resistor R1 is 510 Ω, and the resistance of the second resistor R2 is 4.7K Ω. In the embodiment, the resistance of the first resistor R1 is 510 Ω, and the resistance of the second resistor R2 is 4.7K Ω, but not limited thereto, the first resistor R1 and the second resistor R2 can be adjusted according to actual circuits.
The other structures are the same as those in embodiment mode 1, and are not described again here.
Embodiment mode 3
The difference from embodiment mode 1 is: the bridge rectifier 10 of the present embodiment is in the MB10S model, and the optocoupler 20 is in the EL817 model. In this embodiment, the model of the rectifier 10 is MB10S, and the model of the optocoupler 20 is EL817, but not limited thereto, the models of the rectifier 10 and the optocoupler 20 may be adjusted according to the actual cost requirement, and it is only required that the bridge rectifier 10 activates the optocoupler 20.
The other structures are the same as those in embodiment mode 1, and are not described again here.
Example mode 4
A signal input device includes an NPN sensor and a signal transmission circuit as in embodiment 1, a signal line of the NPN sensor is connected to a first input terminal 11 of a bridge rectifier 10, and a power source anode of the NPN sensor is connected to a second input terminal 12 of the bridge rectifier 10.
It should be noted that: when the sensor is an NPN sensor, a signal line of the NPN sensor is connected to the second INPUT end 12 of the bridge rectifier 10, a power supply positive electrode of the NPN sensor is connected to the first INPUT end 11 of the bridge rectifier 10, at this time, the two INPUT ends are respectively connected to the signal line of the NPN sensor and the power supply positive electrode to form a loop, when the NPN sensor has a signal output, the signal line is at a low level, the loop is switched on, the optocoupler 20 is directly activated, the collector 23 and the emitter 24 of the optocoupler 20 are switched on, and the level of an INPUT pin connected to an external controller changes from low to high, thereby completing signal transmission.
Example mode 5
A signal input device comprises a PNP type sensor and a signal transmission circuit as in embodiment 1, wherein a signal line of the PNP type sensor is connected with a second input end 12 of a bridge rectifier 10, and a power negative electrode of the PNP type sensor is connected with a first input end 11 of the bridge rectifier 10.
It should be noted that: when the sensor is a PNP sensor, a signal line of the PNP sensor is connected to the first INPUT end 11 of the bridge rectifier 10, a power supply cathode of the PNP sensor is connected to the second INPUT end 12 of the bridge rectifier 10, at this time, the two INPUT ends are respectively connected with the signal line and the power supply cathode of the PNP sensor to form a loop, when the PNP sensor has a signal output, a high level is on the signal line, the loop is switched on, the optocoupler 20 is directly activated, the collector 23 and the emitter 24 of the optocoupler 20 are switched on, and a level of an INPUT pin connected with an external controller is changed from low to high, so that signal transmission is completed.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A signal input circuit for a sensor, characterized by: comprises a bridge rectifier (10) and an optical coupler (20), wherein the bridge rectifier (10) comprises a first input end (11), a second input end (12), a direct current output positive pole (13) and a direct current output negative pole (14), the first input end (11) is used for switching and connecting a signal line of the NPN type sensor or the negative electrode of a power supply of the PNP type sensor, the second input end (12) is used for switching and connecting the anode of a power supply of the NPN type sensor or a signal line of the PNP type sensor, the direct current output positive electrode (13) is connected with a positive electrode input end (21) of the optical coupler (20), the direct current output negative electrode (14) is connected with a negative electrode input end (22) of the optical coupler (20), and a collector (23) of the optocoupler (20) is connected with a power supply end, and an emitter (24) of the optocoupler (20) is used for connecting a signal INPUT end (INPUT) of the controller.
2. A signal input circuit for a sensor according to claim 1, wherein: and a first resistor R1 is connected between the direct current output positive electrode (13) and the positive electrode input end (21) of the optocoupler (20).
3. A signal input circuit for a sensor according to claim 2, wherein: the signal input circuit further comprises a second resistor R2, and an emitter (24) of the optocoupler (20) is grounded through the second resistor R2.
4. A signal input circuit for a sensor according to claim 1, wherein: when the sensor is of a PNP type, the first input end (11) and the second input end (12) are connected with a signal wire and a power supply negative electrode of the sensor to form a loop.
5. A signal input circuit for a sensor according to claim 1, wherein: when the sensor is of an NPN type, the first input end (11) and the second input end (12) are connected with a signal line and a power supply positive electrode of the sensor to form a loop.
6. A signal input circuit for a sensor according to claim 1, wherein: the bridge rectifier (10) is of the type MB 10S.
7. A signal input circuit for a sensor according to claim 1, wherein: the type of the optical coupler (20) is EL 817.
8. A signal input circuit for a sensor according to claim 3, wherein: the resistance of the first resistor R1 is 510 omega, and the resistance of the second resistor R2 is 4.7K omega.
9. A signal input device, characterized by: comprising an NPN-type sensor and a signal input circuit according to any of claims 1-8, the signal line of the NPN-type sensor being connected to the first input (11) of the bridge rectifier (10) and the positive supply of the NPN-type sensor being connected to the second input (12) of the bridge rectifier (10).
10. A signal input device, characterized by: -comprising a PNP sensor and a signal input circuit according to any of claims 1 to 8, the signal line of the PNP sensor being connected to the second input (12) of the bridge rectifier (10), the negative supply terminal of the PNP sensor being connected to the first input (11) of the bridge rectifier (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021617780.1U CN213547491U (en) | 2020-08-06 | 2020-08-06 | Signal input circuit and signal input device that sensor was used |
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| CN202021617780.1U CN213547491U (en) | 2020-08-06 | 2020-08-06 | Signal input circuit and signal input device that sensor was used |
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| CN213547491U true CN213547491U (en) | 2021-06-25 |
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