CN212255470U - Current stepping sampling circuit of circuit breaker, equipment and Internet of things system - Google Patents
Current stepping sampling circuit of circuit breaker, equipment and Internet of things system Download PDFInfo
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- CN212255470U CN212255470U CN202020463889.8U CN202020463889U CN212255470U CN 212255470 U CN212255470 U CN 212255470U CN 202020463889 U CN202020463889 U CN 202020463889U CN 212255470 U CN212255470 U CN 212255470U
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Abstract
The embodiment of the utility model discloses current stepping sampling circuit, circuit breaker, equipment and thing networking systems of circuit breaker. The circuit comprises: the device comprises a current grading module, a voltage following module and a control module; the first input end of the current grading module is electrically connected with the input end of the mutual inductor, and the output end of the current grading module is electrically connected with the output end of the mutual inductor; the input end of the voltage following module is electrically connected with the first input end of the current grading module, and the output end of the voltage following module is electrically connected with the control module and used for sending the voltage of the first input end of the current grading module to the control module; the control module is respectively electrically connected with the second input end of the current grading module and is used for inputting a driving signal to the current grading module so as to drive the current grading module to carry out current grading. The utility model discloses a carry out signal acquisition to the electric current of multiple grade, improved the sampling precision of electric current.
Description
Technical Field
The utility model relates to a circuit breaker technical field especially relates to a current stepping sampling circuit, circuit breaker, equipment and thing networking systems of circuit breaker.
Background
The circuit breaker can close, bear and break the switching device of the electric current under the normal circuit condition and can close, bear and break the electric current under the abnormal circuit condition in the specified time. With the development of electronic technology, circuit breakers are widely used in various circuits, and accurate detection of current through a circuit breaker is critical to the operation of the circuit breaker. The existing current stepping sampling circuit can only sample one current, and the problem of signal loss occurs in the sampling of other currents, so that the current sampling precision is not high. Therefore, it is important to develop a current step sampling circuit of a circuit breaker, which can improve the current sampling precision.
SUMMERY OF THE UTILITY MODEL
Based on this, it is necessary to provide a current stepping sampling circuit of a circuit breaker, a device and an internet of things system for solving the technical problem of low current sampling precision in the prior art.
In a first aspect, the utility model provides a current stepping sampling circuit of circuit breaker, based on a circuit breaker that contains the mutual-inductor, the current stepping sampling circuit of circuit breaker includes: the device comprises a current grading module, a voltage following module and a control module;
the first input end of the current grading module is electrically connected with the input end of the mutual inductor, and the output end of the current grading module is electrically connected with the output end of the mutual inductor;
the input end of the voltage following module is electrically connected with the first input end of the current grading module, and the output end of the voltage following module is electrically connected with the control module and used for sending a voltage signal of the first input end of the current grading module to the control module;
the control module is electrically connected with the second input end of the current grading module and used for inputting a driving signal to the current grading module so as to drive the current grading module to carry out current grading.
In one embodiment, the current binning module comprises: the switch comprises a first stepping resistor, a second stepping resistor and a switch sub-circuit;
the input end of the first stepping resistor and the input end of the second stepping resistor are electrically connected with the input end of the mutual inductor;
the output end of the second stepping resistor is electrically connected with the output end of the mutual inductor;
a first input end of the switch sub-circuit is electrically connected with an output end of the first stepping resistor, and an output end of the switch sub-circuit is electrically connected with an output end of the mutual inductor;
the control module is electrically connected with a second input end of the switch sub-circuit and is used for inputting the driving signal to the current stepping module, and the driving signal is used for connecting or disconnecting the first stepping resistor and the output end of the mutual inductor;
the resistance value of the first stepping resistor is smaller than that of the second stepping resistor.
In one embodiment, the switch sub-circuit comprises: a first MOS transistor;
the D pole of the first MOS tube is electrically connected with the output end of the first stepping resistor, and the S pole of the first MOS tube is electrically connected with the output end of the mutual inductor;
the control module is electrically connected with a G pole of the first MOS tube and used for inputting the driving signal to the first MOS tube.
In one embodiment, the switch sub-circuit further comprises: the MOS transistor comprises a second MOS transistor, a first resistor and a second resistor;
the G pole of the first MOS tube is electrically connected with the D pole of the second MOS tube and the output end of the first resistor;
the S pole of the second MOS tube is grounded;
the input end of the first resistor is connected with a 5V power supply;
the output end of the second resistor is electrically connected with the G pole of the second MOS tube;
the control module is electrically connected with the input end of the second resistor and used for inputting the driving signal to the second resistor and the second MOS tube.
In one embodiment, the current binning module further comprises: a first filter capacitor;
the input end of the first filter capacitor is electrically connected with the input end of the first grading resistor and the input end of the second grading resistor, and the output end of the first filter capacitor is grounded.
In one embodiment, the voltage following module comprises: an operational amplifier;
the non-inverting input end of the operational amplifier is electrically connected with the first input end of the current grading module, and the output end of the operational amplifier is electrically connected with the control module;
wherein the inverting input terminal of the operational amplifier is electrically connected with the output terminal of the operational amplifier.
In one embodiment, the voltage follower module further comprises: a third resistor and a second filter capacitor;
the input end of the third resistor is electrically connected with the output end of the operational amplifier and the inverting input end of the operational amplifier, and the output end of the third resistor is electrically connected with the control module;
the input end of the second filter capacitor is electrically connected with the output end of the third resistor, and the output end of the second filter capacitor is grounded.
In a second aspect, the present invention further provides a circuit breaker, including: the current stepping sampling circuit and the mutual inductor of the circuit breaker in any one of the first aspect.
A third aspect of the present invention also provides an electronic device, including: at least one circuit breaker;
the circuit breaker includes: the current step sampling circuit of the circuit breaker of any one of the first aspect.
In a fourth aspect, the utility model also provides a thing networking system, include: at least one circuit breaker;
the circuit breaker includes: the current step sampling circuit of the circuit breaker of any one of the first aspect.
To sum up, the utility model discloses a current stepping sampling circuit of circuit breaker is applied to the circuit breaker, and the circuit breaker includes the mutual-inductor, and the mutual-inductor carries out the current stepping to the first input current of current stepping module, and control module carries out the current stepping to the current of current stepping module input drive signal in order to realize drive current stepping module to the current of mutual-inductor input, and the voltage signal transmission of the first input of rethread voltage following module with current stepping module gives control module to realized carrying out signal acquisition to the electric current of multiple grade, improved the sampling precision of electric current. Therefore, the utility model discloses a carry out signal acquisition to the electric current of multiple grade, improved the sampling precision of electric current.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Wherein:
FIG. 1 is a block diagram of a current step sampling circuit of a circuit breaker according to one embodiment;
fig. 2 is a circuit schematic of a current stepping module of the current stepping sampling circuit of the circuit breaker of fig. 1;
fig. 3 is a circuit schematic of a voltage follower module of the current step sampling circuit of the circuit breaker of fig. 1.
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 without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 to 3, in one embodiment, a current-stepping sampling circuit of a circuit breaker is provided, which is based on a circuit breaker including a transformer 80, and includes: the device comprises a current grading module 10, a voltage following module 20 and a control module 30;
a first input end of the current stepping module 10 is electrically connected with an input end of the transformer 80, and an output end of the current stepping module 10 is electrically connected with an output end of the transformer 80;
the input end of the voltage following module 20 is electrically connected to the first input end of the current stepping module 10, and the output end of the voltage following module 20 is electrically connected to the control module 30, and is configured to send a voltage signal at the first input end of the current stepping module 10 to the control module 30;
the control module 30 is electrically connected to a second input end of the current stepping module 10, and is configured to input a driving signal to the current stepping module 10 to drive the current stepping module 10 to perform current stepping.
The circuit breaker is applied to the current stepping sampling circuit of the circuit breaker of this embodiment, the circuit breaker includes mutual-inductor 80, mutual-inductor 80 carries out the current stepping to the first input end input current of current stepping module 10, control module 30 inputs drive signal in order to realize that drive current stepping module 10 carries out the current stepping to the current of mutual-inductor 80 input to current stepping module 10, the voltage signal transmission of the first input end of rethread voltage following module 20 with current stepping module 10 gives control module 30, thereby realized carrying out signal acquisition to the electric current of multiple grades, the sampling precision of electric current has been improved.
The control module 30 may be an MCU (micro control unit) selected from the prior art, and is not limited in this example.
It is understood that the control module 30 is electrically connected to the second input terminal of the current stepping module 10, and includes: the AD sampling interface of the control module 30 is electrically connected to the second input terminal of the current stepping module 10.
It will be appreciated that the control module 30 determines the voltage signal to which the first input of the current binning module 10 is electrically connected, from the voltage signal sent by the voltage follower module 20.
In one embodiment, the current binning module 10 comprises: a first stepping resistor 11, a second stepping resistor 12 and a switch sub-circuit 13;
the input end of the first stepping resistor 11 and the input end of the second stepping resistor 12 are electrically connected with the input end of the transformer 80;
the output end of the second stepping resistor 12 is electrically connected with the output end of the transformer 80;
a first input end of the switch sub-circuit 13 is electrically connected with an output end of the first stepping resistor 11, and an output end of the switch sub-circuit 13 is electrically connected with an output end of the transformer 80;
the control module 30 is electrically connected to a second input end of the switch sub-circuit 13, and is configured to input the driving signal to the current stepping module 10, where the driving signal is used to connect or disconnect the first stepping resistor 11 and the output end of the transformer 80;
wherein, the resistance value of the first step resistor 11 is smaller than the resistance value of the second step resistor 12. Two-gear current stepping is realized by adopting two modes of working of the second stepping resistor 12 and parallel working of the first stepping resistor 11 and the second stepping resistor 12.
When a small current needs to be detected, the control module 30 inputs a low level to the second input end of the current stepping module 10, at this time, the switch sub-circuit 13 is turned off, and the current stepping module 10 only operates the second stepping resistor 12; for the current with the same variation amplitude, when the second grading resistor 12 adopts a large resistance value, the voltage signal of the current grading module 10 is larger than the voltage signal of the current grading module 10 when a small resistance value is adopted, and the sampling of the large voltage signal and the sampling of the small voltage signal can be more accurate, so that the sampling precision of the current is improved.
When a large current needs to be detected, the control module 30 inputs a high level to the second input end of the current stepping module 10, at this time, the switch sub-circuit 13 is turned on, and the first stepping resistor 11 and the second stepping resistor 12 of the current stepping module 10 work in parallel, so that the large current can be sampled.
In one embodiment, when the current input to the first input of the current stepping module 10 is higher than 3A, the control module 30 inputs a high level to the second input of the current stepping module 10; when the current input to the first input terminal of the current stepping module 10 is less than or equal to 3A, the control module 30 inputs a low level to the second input terminal of the current stepping module 10.
The first and second stepping resistors 11 and 12 may be resistors selected from the prior art, and are not described herein.
In one embodiment, the switch sub-circuit 13 comprises: a first MOS transistor;
the D pole of the first MOS transistor is electrically connected with the output end of the first stepping resistor 11, and the S pole of the first MOS transistor is electrically connected with the output end of the transformer 80;
the control module 30 is electrically connected to the G pole of the first MOS transistor, and is configured to input the driving signal to the first MOS transistor. The switching function between the first stepping resistor 11 and the output end of the transformer 80 is realized through a first MOS transistor; when the high level is input into the first MOS transistor, the first stepping resistor 11 is connected to the output end of the transformer 80; when the low level is input to the first MOS transistor, the first stepping resistor 11 is disconnected from the output end of the transformer 80.
The first MOS transistor may be selected from the prior art, and will not be described herein.
In one embodiment, the switch sub-circuit 13 further comprises: the MOS transistor comprises a second MOS transistor, a first resistor and a second resistor;
the G pole of the first MOS tube is electrically connected with the D pole of the second MOS tube and the output end of the first resistor;
the S pole of the second MOS tube is grounded;
the input end of the first resistor is connected with a 5V power supply;
the output end of the second resistor is electrically connected with the G pole of the second MOS tube;
the control module 30 is electrically connected to an input end of the second resistor, and is configured to input the driving signal to the second resistor and the second MOS transistor.
The first resistor and the second resistor may be resistors selected from the prior art, which is not described herein.
The second MOS transistor may be an NMOS transistor selected from the prior art, which is not described herein.
In one embodiment, the first MOS transistor and the second MOS transistor have the same specification parameters.
In one embodiment, the current binning module 10 further comprises: a first filter capacitor;
the input end of the first filter capacitor is electrically connected with the input end of the first grading resistor 11 and the input end of the second grading resistor 12, and the output end of the first filter capacitor is grounded. By arranging the first filter capacitor, the anti-interference capability of the current stepping module 10 is improved, so that the working stability of the current stepping sampling circuit of the circuit breaker is further improved.
The first filter capacitor may be selected from the prior art, and is not limited in this example.
In one embodiment, the voltage follower module 20 includes: an operational amplifier;
the non-inverting input end of the operational amplifier is electrically connected with the first input end of the current stepping module 10, and the output end of the operational amplifier is electrically connected with the control module 30;
wherein the inverting input terminal of the operational amplifier is electrically connected with the output terminal of the operational amplifier. By providing the voltage follower module 20, isolation is provided between the control module 30 and the first input terminal of the current stepping module 10.
The operational amplifier may be selected from the prior art so that the voltage signal at the output of the operational amplifier is the same as the voltage signal at the non-inverting input of the operational amplifier, with an amplification factor close to 1.
In one embodiment, the voltage follower module 20 further comprises: a third resistor and a second filter capacitor;
the input end of the third resistor is electrically connected with the output end of the operational amplifier and the inverting input end of the operational amplifier, and the output end of the third resistor is electrically connected with the control module 30;
the input end of the second filter capacitor is electrically connected with the output end of the third resistor, and the output end of the second filter capacitor is grounded. The voltage division function is generated on the voltage following module 20 through the third resistor, and the anti-interference capability of the voltage following module 20 is improved through the second filter capacitor, so that the working stability of the current stepping sampling circuit of the circuit breaker is further improved.
The third voltage resistor may be selected from the prior art, and will not be described herein.
The second filter capacitor may be selected from the prior art, and is not limited in this example.
As shown in fig. 2, in an embodiment, fig. 2 illustrates a schematic circuit diagram of the current stepping module 10, in fig. 2, RA1 is a first stepping resistor 11, RA2 is a second stepping resistor 12, CA1 is a first filter capacitor, QA1 is a first MOS transistor, QA2 is a second MOS transistor, RA3 is a first resistor, RA5 is a second resistor, AIN _ la is electrically connected to an input terminal of the transformer 80, VREF is electrically connected to an output terminal of the transformer 80, and SYa is electrically connected to the control module 30.
As shown in fig. 3, in one embodiment, fig. 3 illustrates a schematic circuit diagram of the voltage follower module 20, in fig. 3, AIN _ la is electrically connected to the first input terminal of the current stepping module 10 (i.e., AIN _ la in fig. 2), LM2902PT is an operational amplifier, R54 is a third resistor, C26 is a second filter capacitor, and ADC _ la is electrically connected to the control module 30.
In one embodiment, RA resistors are used as the first and second stepping resistors 11, 12 and the first and second resistors.
In one embodiment, the resistance value of the first step resistor 11 is 9 Ω to 11 Ω; the resistance value of the second grading resistor 12 is 198 Ω -202 Ω; the resistance value of the first resistor is 1000 omega; the resistance value of the second resistor is 1000 omega; the resistance value of the third resistor is 1000 omega.
In one embodiment, the resistance value of the first step resistor 11 is 10 Ω; the resistance value of the second grading resistor 12 is 200 Ω; the resistance value of the first resistor is 1000 omega; the resistance value of the second resistor is 1000 omega; the resistance value of the third resistor is 1000 omega.
In one embodiment, a circuit breaker is presented, comprising: the current stepping sampling circuit of the circuit breaker and the mutual inductor 80.
The mutual inductor 80 of the circuit breaker of this embodiment inputs current to the first input end of the current stepping module 10, the control module 30 inputs a driving signal to the current stepping module 10 to realize that the current stepping module 10 carries out current stepping on the current input by the mutual inductor 80, and then the voltage following module 20 sends the voltage signal of the first input end of the current stepping module 10 to the control module 30, so that signal acquisition is carried out on the currents of various grades, and the sampling precision of the current is improved.
In one embodiment, an electronic device is presented, comprising: at least one circuit breaker;
the circuit breaker includes: the current stepping sampling circuit of the circuit breaker.
The mutual inductor 80 of the circuit breaker of this embodiment inputs current to the first input end of the current stepping module 10, the control module 30 inputs a driving signal to the current stepping module 10 to realize that the current stepping module 10 carries out current stepping on the current input by the mutual inductor 80, and then the voltage following module 20 sends the voltage signal of the first input end of the current stepping module 10 to the control module 30, so that signal acquisition is carried out on the currents of various grades, and the sampling precision of the current is improved.
In one embodiment, an internet of things system is provided, including: at least one circuit breaker;
the circuit breaker includes: the current stepping sampling circuit of the circuit breaker.
The mutual inductor 80 of the circuit breaker of this embodiment inputs current to the first input end of the current stepping module 10, the control module 30 inputs a driving signal to the current stepping module 10 to realize that the current stepping module 10 carries out current stepping on the current input by the mutual inductor 80, and then the voltage following module 20 sends the voltage signal of the first input end of the current stepping module 10 to the control module 30, so that signal acquisition is carried out on the currents of various grades, and the sampling precision of the current is improved.
The Internet of things system connects various articles with the Internet according to an agreed protocol through information equipment such as radio frequency automatic identification, an infrared sensor, a global positioning system, a laser scanner, an image sensor and the like, and performs information exchange and communication so as to realize intelligent identification, positioning, tracking, monitoring and management.
In one embodiment, the internet of things system further comprises an internet of things server side and an internet of things terminal device;
at least one circuit breaker is installed in the terminal equipment of the Internet of things;
the circuit breaker further includes: a wireless communication module for performing wireless communication;
the breaker passes through wireless communication module with thing networking server end carries out communication connection to be used for sending breaker operating condition data for thing networking server end receives the circuit breaker control command that thing networking server end sent.
It is understood that the control module 30 of the circuit breaker controls the operation of the components of the circuit breaker according to the circuit breaker control commands.
The circuit breaker working state data refer to data generated when the circuit breaker works.
The wireless communication module may be a WIFI communication module selected from the prior art, which is not limited in this example.
It should be noted that the current stepping sampling circuit of the circuit breaker, the electronic device and the internet of things system belong to a general inventive concept, and the contents in the embodiments of the current stepping sampling circuit of the circuit breaker, the electronic device and the internet of things system are mutually applicable.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. The utility model provides a current stepping sampling circuit of circuit breaker, based on a circuit breaker that contains the mutual-inductor, its characterized in that, the current stepping sampling circuit of circuit breaker includes: the device comprises a current grading module, a voltage following module and a control module;
the first input end of the current grading module is electrically connected with the input end of the mutual inductor, and the output end of the current grading module is electrically connected with the output end of the mutual inductor;
the input end of the voltage following module is electrically connected with the first input end of the current grading module, and the output end of the voltage following module is electrically connected with the control module and used for sending a voltage signal of the first input end of the current grading module to the control module;
the control module is electrically connected with the second input end of the current grading module and used for inputting a driving signal to the current grading module so as to drive the current grading module to carry out current grading.
2. The current step sampling circuit of a circuit breaker of claim 1, wherein the current step module comprises: the switch comprises a first stepping resistor, a second stepping resistor and a switch sub-circuit;
the input end of the first stepping resistor and the input end of the second stepping resistor are electrically connected with the input end of the mutual inductor;
the output end of the second stepping resistor is electrically connected with the output end of the mutual inductor;
a first input end of the switch sub-circuit is electrically connected with an output end of the first stepping resistor, and an output end of the switch sub-circuit is electrically connected with an output end of the mutual inductor;
the control module is electrically connected with a second input end of the switch sub-circuit and is used for inputting the driving signal to the current stepping module, and the driving signal is used for connecting or disconnecting the first stepping resistor and the output end of the mutual inductor;
the resistance value of the first stepping resistor is smaller than that of the second stepping resistor.
3. The current step sampling circuit of a circuit breaker of claim 2, wherein the switch sub-circuit comprises: a first MOS transistor;
the D pole of the first MOS tube is electrically connected with the output end of the first stepping resistor, and the S pole of the first MOS tube is electrically connected with the output end of the mutual inductor;
the control module is electrically connected with a G pole of the first MOS tube and used for inputting the driving signal to the first MOS tube.
4. The current step sampling circuit of a circuit breaker of claim 3, wherein said switch sub-circuit further comprises: the MOS transistor comprises a second MOS transistor, a first resistor and a second resistor;
the G pole of the first MOS tube is electrically connected with the D pole of the second MOS tube and the output end of the first resistor;
the S pole of the second MOS tube is grounded;
the input end of the first resistor is connected with a 5V power supply;
the output end of the second resistor is electrically connected with the G pole of the second MOS tube;
the control module is electrically connected with the input end of the second resistor and used for inputting the driving signal to the second resistor and the second MOS tube.
5. The current step sampling circuit of a circuit breaker of claim 2, wherein the current step module further comprises: a first filter capacitor;
the input end of the first filter capacitor is electrically connected with the input end of the first grading resistor and the input end of the second grading resistor, and the output end of the first filter capacitor is grounded.
6. The current step sampling circuit of a circuit breaker according to any one of claims 1 to 5, wherein said voltage following module comprises: an operational amplifier;
the non-inverting input end of the operational amplifier is electrically connected with the first input end of the current grading module, and the output end of the operational amplifier is electrically connected with the control module;
wherein the inverting input terminal of the operational amplifier is electrically connected with the output terminal of the operational amplifier.
7. The current step sampling circuit of a circuit breaker of claim 6, wherein said voltage follower module further comprises: a third resistor and a second filter capacitor;
the input end of the third resistor is electrically connected with the output end of the operational amplifier and the inverting input end of the operational amplifier, and the output end of the third resistor is electrically connected with the control module;
the input end of the second filter capacitor is electrically connected with the output end of the third resistor, and the output end of the second filter capacitor is grounded.
8. A circuit breaker, comprising: the current-stepping sampling circuit of the circuit breaker, the mutual inductor of any one of claims 1 to 7.
9. An apparatus, comprising: at least one circuit breaker;
the circuit breaker includes: the current step sampling circuit of the circuit breaker of any one of claims 1 to 7.
10. An internet of things system, comprising: at least one circuit breaker;
the circuit breaker includes: the current step sampling circuit of the circuit breaker of any one of claims 1 to 7.
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| CN202020463889.8U CN212255470U (en) | 2020-04-01 | 2020-04-01 | Current stepping sampling circuit of circuit breaker, equipment and Internet of things system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113311322A (en) * | 2021-05-28 | 2021-08-27 | 苏州欧菲特电子股份有限公司 | Load driving and mutual inductor signal processing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113311322A (en) * | 2021-05-28 | 2021-08-27 | 苏州欧菲特电子股份有限公司 | Load driving and mutual inductor signal processing device |
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