CN213023313U - Safety control terminal - Google Patents
Safety control terminal Download PDFInfo
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- CN213023313U CN213023313U CN202021949221.0U CN202021949221U CN213023313U CN 213023313 U CN213023313 U CN 213023313U CN 202021949221 U CN202021949221 U CN 202021949221U CN 213023313 U CN213023313 U CN 213023313U
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Abstract
The application relates to a safety control terminal, in particular to a data transmission terminal, which comprises a shell, a terminal host arranged in the shell and a voltage monitoring unit, wherein the output end of the voltage monitoring unit is electrically connected with the terminal host; the voltage monitoring unit comprises a transformation circuit and a voltage sampling circuit, the transformation circuit comprises three groups of single-phase transformation circuits which are respectively connected with three live wires, the single-phase transformation circuit comprises a voltage transformer T, two ends of a primary side of the voltage transformer T are respectively connected in series with a first resistor R1, and the other ends of the two first resistors R1 are respectively connected with one live wire and a zero wire of a three-phase power; and the input end of the voltage sampling circuit is connected to two ends of the secondary side of the voltage transformer T. This application has better cooperation and does the effect of safety control to shops etc..
Description
Technical Field
The application relates to a data transmission terminal, in particular to a safety control terminal.
Background
The internet of things refers to ubiquitous terminal equipment and facilities, including sensors with 'internal intelligence', mobile terminals, industrial systems, building control systems, household intelligent facilities, video monitoring systems and the like, and 'external enabling', such as various assets attached with RFID, intelligent objects or animals such as individuals and vehicles carrying wireless terminals or 'intelligent dust', and the like, by means of various wireless and/or wired long-distance and/or short-distance communication networks, modes such as interconnection, application large integration, SaaS operation based on cloud computing (cattle computing) and the like are realized, and under the circumstances of an intranet, a private network and/or the internet, a proper information safety guarantee mechanism is adopted to provide safe, controllable and personalized real-time online monitoring, positioning and tracing, alarm linkage, scheduling command, plan management, remote control, safety precaution and the like, The management and service functions of remote maintenance, online upgrade, statistical forms, decision support, leadership desktop and the like realize the integration of ' management, control and camp ' of ' all things ' with high efficiency, energy conservation, safety and environmental protection '.
Currently, internet of things technology is widely used in a plurality of industries, such as: the field of security technology in smart cities; in the construction process of the internet of things, data transmission and communication between devices are important links, and the inventor considers that the existing data transmission terminal used as intermediate transmission has the following defects:
in the safety management process, need synthesize the electric fire and the video monitoring etc. that acquire each shop, and current data transmission terminal is mostly just done data transmission, whether electric fault appears in shops etc. even the conflagration needs the installation or docks other corresponding monitoring systems and acquires, leads to the result of use not good relatively, consequently this application proposes a new technical scheme.
SUMMERY OF THE UTILITY MODEL
Safety control is done to shops etc. for better cooperation, this application provides a safety control terminal.
The application provides a safety control terminal adopts following technical scheme:
a safety control terminal comprises a shell, a terminal host and a voltage monitoring unit, wherein the terminal host is arranged in the shell; the voltage monitoring unit comprises a transformation circuit and a voltage sampling circuit, the transformation circuit comprises three groups of single-phase transformation circuits which are respectively connected with three live wires, the single-phase transformation circuit comprises a voltage transformer T, two ends of a primary side of the voltage transformer T are respectively connected in series with a first resistor R1, and the other ends of the two first resistors R1 are respectively connected with one live wire and a zero wire of a three-phase power; and the input end of the voltage sampling circuit is connected to two ends of the secondary side of the voltage transformer T.
By adopting the technical scheme, after the voltage monitoring device is applied, the voltage monitoring device can be directly connected with three-phase power of a specified store through the single-phase voltage transformation circuit, and then each live wire of the three-phase power is subjected to voltage monitoring through the sampling circuit; meanwhile, due to the existence of the first resistor R1, voltage division and current limitation can be performed, and the probability of damage of the voltage transformer is reduced.
Preferably, a fuse F is connected in series between the first resistor R1 and the live line of the three-phase power.
By adopting the technical scheme, the fuse F can be used for protecting a subsequent circuit, and the probability of electrical damage is reduced.
Preferably, the single-phase transformation circuit further includes a voltage dependent resistor V connected in parallel with the two first resistors R1 and the primary side of the voltage transformer T.
By adopting the technical scheme, the piezoresistor V can be used for responding to transient voltage, absorbing excessive transient energy and further protecting other subsequent circuit structures.
Preferably, the voltage sampling circuit comprises a first voltage follower U1, two secondary sides of the voltage transformer T are respectively connected to an input end of a first voltage follower U1, an output end of the first voltage follower U1 is connected in series with a second resistor R2, the other end of the second resistor R2 is electrically connected with a first capacitor C1, and the other end of the first capacitor C1 is grounded; and a lead is pulled out from the connection point of the second resistor R2 and the first capacitor C1 to serve as a voltage detection output terminal AD V.
By adopting the technical scheme, the voltage follower circuit is a derivative product of the in-phase amplifying circuit and is the in-phase amplifying circuit with the amplification factor of 1; the ideal in-phase amplifying circuit has infinite input impedance and infinite output impedance, when the input impedance is very high, the circuit is equivalent to an open circuit for a preceding circuit, when the output impedance is very low, the circuit is equivalent to a constant voltage source for a subsequent circuit, namely, the output voltage is not influenced by the impedance of the subsequent circuit, and the circuit is equivalent to an open circuit for the preceding circuit and the output voltage is not influenced by the impedance of the subsequent circuit, even if the circuits are not influenced by each other, the sampling effect of the application is relatively better; the second resistor R2 and the first capacitor C1 form a filter circuit, and the filter circuit can filter noise waves of the output signal of the first voltage follower U1, so that the sampling effect is improved.
Preferably, an RC parallel circuit is connected in series to an input end of the first voltage follower U1, and two ends of a secondary side of the voltage transformer T are electrically connected to two ends of the RC parallel circuit, respectively.
By adopting the technical scheme, the RC parallel circuit can be used for filtering the output of the voltage transformer T.
Preferably, a connection point of the negative output of the secondary side of the voltage transformer T and the RC parallel circuit is electrically connected with a reference voltage circuit.
By adopting the technical scheme, the output of the reference voltage circuit can be used as a reference, and the stability of the circuit is improved.
Preferably, the reference voltage circuit comprises a second voltage follower U2, the input end of the second voltage follower U2 is electrically connected with a third resistor R3, and the other end of the third resistor R3 is electrically connected with a power supply; the connection point of the third resistor R3 and the second voltage follower U2 is electrically connected with a fourth resistor R4, and the other end of the fourth resistor R4 is grounded.
By adopting the technical scheme, the isolation effect of the voltage follower can be utilized, so that the use of the reference circuit is not interfered by the equivalent internal resistance change of the next-stage circuit.
Preferably, a positive power end of the second voltage follower U2 is electrically connected with a second capacitor C2, and a connection point of the second capacitor C2 and the second voltage follower U2 is used for connecting a power supply.
By adopting the above technical scheme, the second capacitor C2 can be used as a decoupling capacitor, and the influence of the unstable phenomenon of the power supply on the circuit can be reduced.
In summary, the present application includes at least one of the following beneficial technical effects: terminal host computer electricity is connected with can be directly to the three-phase electricity of shop etc. do voltage monitoring's voltage monitoring unit to the cooperation staff that this application can be better does safety control.
Drawings
FIG. 1 is a schematic diagram of the overall structure of one embodiment of the present application;
FIG. 2 is a circuit schematic of a voltage transformation circuit according to an embodiment of the present application;
FIG. 3 is a circuit schematic of a voltage sampling circuit according to one embodiment of the present application.
Description of reference numerals: 1. a housing; 2. a voltage transformation circuit; 3. a voltage sampling circuit; 31. an RC parallel circuit.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses a safety control terminal. Referring to fig. 1, the safety control terminal includes a housing 1 and a terminal host arranged in the housing 1, the housing 1 is a hollow cuboid structure, the terminal host is an integrated circuit structure, and an integrated board of the terminal host is fixed in the housing 1 through a bolt.
The terminal host at least comprises a control unit, a wireless communication unit (such as a GPRS module) connected with the control unit, an upper communication interface, a lower communication interface (such as RS-485) and a power interface; the terminal host is a main body for realizing the communication transmission function of the conventional data transmission terminal, and specifically, takes the control unit as an example: the control unit includes at least a microcontroller (e.g., STM32F072 VB) and a memory.
In order to cooperate the safety control work better, this application still includes voltage monitoring unit, and voltage monitoring unit's output is connected in the terminal host computer, and it can directly be used for doing voltage monitoring to the three-phase electricity of stores etc..
Referring to fig. 2 and 3, the voltage monitoring unit includes a voltage transforming circuit 2 and a voltage sampling circuit 3.
The transformation circuit 2 comprises three groups of single-phase transformation circuits which are respectively connected to three live wires, each single-phase transformation circuit comprises a voltage transformer T, two ends of a primary side of each voltage transformer T are respectively connected with a first resistor R1 in series, the other end of one first resistor R1 is electrically connected to one live wire, and the other end of the other first resistor R1 is electrically connected to a zero wire. The input end of the voltage sampling circuit 3 is connected to two ends of the secondary side of the voltage transformer T.
When the voltage sampling device is used, the voltage monitoring unit reduces the voltage on a live wire through the voltage transformer T so as to facilitate subsequent voltage sampling.
Referring to fig. 2, a fuse F is connected in series between the first resistor R1 and the live wire of the three-phase power, and the fuse F can protect the lower circuit and prevent the lower circuit structure from being damaged by excessive current.
Furthermore, a voltage dependent resistor V is also arranged, and the voltage dependent resistor V is simultaneously connected with the first resistor R1 and the primary side of the electric transformer T in parallel. The voltage dependent resistor V can respond to transient voltage, absorb overlarge transient energy and further protect a lower-level circuit structure.
Referring to fig. 3, the voltage sampling circuit includes a first voltage follower U1, an input terminal of the first voltage follower U1 is connected in series with an RC parallel circuit 31;
two ends of the secondary side of the voltage transformer T are OUT _ L (positive) and OUT _ N (negative) respectively; OUT _ L is electrically connected to a connection point of the RC parallel circuit 31 and the first voltage follower U1, and OUT _ N is electrically connected to the other end of the RC parallel circuit 31;
the output end of the first voltage follower U1 is connected in series with a second resistor R2, the other end of the second resistor R2 is electrically connected with a first capacitor C1, and the other end of the first capacitor C1 is grounded; and a lead is pulled out from the connection point of the second resistor R2 and the first capacitor C1 to serve as a voltage detection output end AD V, and the voltage detection output end AD V is electrically connected to a control unit of the terminal host machine and used for feedback.
The first voltage follower U1 is provided because the voltage follower circuit is a derivative of the in-phase amplifier circuit and is an in-phase amplifier circuit with an amplification factor of 1; the input impedance of an ideal in-phase amplifying circuit is infinite, and the output impedance is infinitesimal; when the input impedance is very high, the circuit is equivalent to an open circuit for a front-stage circuit, when the output impedance is very low, the circuit is equivalent to a constant voltage source for a rear-stage circuit, namely the output voltage is not influenced by the impedance of the rear-stage circuit, and the circuit which is equivalent to an open circuit for the front-stage circuit and is not influenced by the impedance of the rear-stage circuit has an isolation function certainly, even if the front-stage circuit and the rear-stage circuit are not influenced by each other, so that the sampling effect is relatively better by applying the first voltage follower U1;
the second resistor R2 and the first capacitor C1 form a filter circuit which can filter clutter of the signal output by the first voltage follower U1, and the sampling effect is improved; the RC parallel circuit 31 performs filtering processing on the output of the voltage transformer T.
Referring to fig. 3, the negative output of the secondary side of the voltage transformer T, i.e. the connection point of (OUT _ N) and the RC parallel circuit, is further electrically connected with a reference voltage circuit to serve as a reference, so as to improve the stability of sampling.
The reference voltage circuit comprises a second voltage follower U2, the input end of the second voltage follower U2 is electrically connected with a third resistor R3, and the other end of the third resistor R3 is electrically connected with a power supply; the connection point of the third resistor R3 and the second voltage follower U2 is electrically connected with a fourth resistor R4, and the other end of the fourth resistor R4 is grounded.
The voltage follower is selected to form a reference voltage circuit, and the use of the reference circuit is not interfered by the equivalent internal resistance change of the next stage circuit by utilizing the isolation effect of the voltage follower.
Referring to fig. 3, the positive power terminal of the second voltage follower U2 is electrically connected with a second capacitor C2, and the connection point of the second capacitor C2 and the second voltage follower U2 is used for connecting a power supply. The second capacitor C2 may act as a decoupling capacitor to reduce the effect of power supply instability on the circuit.
To sum up, this application accessible voltage monitoring unit is direct to be voltage monitoring to the three-phase electricity in stores etc. and the safety control is done to cooperation staff that can be better.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a safety control terminal, includes casing (1) and sets up the terminal host computer in casing (1), its characterized in that: the output end of the voltage monitoring unit is electrically connected with the terminal host; the voltage monitoring unit comprises a transformation circuit (2) and a voltage sampling circuit (3), the transformation circuit (2) comprises three groups of single-phase transformation circuits (2) which are respectively connected with three live wires, the single-phase transformation circuit (2) comprises a voltage transformer T, two ends of a primary side of the voltage transformer T are respectively connected in series with a first resistor R1, the other end of one first resistor R1 is electrically connected with one live wire, and the other end of the other first resistor R1 is electrically connected with a zero line; and the input end of the voltage sampling circuit (3) is connected to two ends of the secondary side of the voltage transformer T.
2. The security management and control terminal according to claim 1, characterized in that: and a fuse F is connected in series between the first resistor R1 and the live wire of the three-phase power.
3. The security management and control terminal according to claim 2, characterized in that: the single-phase transformation circuit (2) further comprises a voltage dependent resistor V which is connected with the two first resistors R1 and the primary side of the voltage transformer T in parallel.
4. The security management and control terminal according to claim 1, characterized in that: the voltage sampling circuit (3) comprises a first voltage follower U1, two secondary sides of the voltage transformer T are respectively connected to the input end of the first voltage follower U1, the output end of the first voltage follower U1 is connected in series with a second resistor R2, the other end of the second resistor R2 is electrically connected with a first capacitor C1, and the other end of the first capacitor C1 is grounded; and a lead is pulled out from the connection point of the second resistor R2 and the first capacitor C1 to serve as a voltage detection output terminal AD V.
5. The security management and control terminal according to claim 4, wherein: the input end of the first voltage follower U1 is connected in series with an RC parallel circuit (31), and the two ends of the secondary side of the voltage transformer T are respectively and electrically connected with the two ends of the RC parallel circuit (31).
6. The security management and control terminal according to claim 5, characterized in that: and the negative output of the secondary side of the voltage transformer T and the connection point of the RC parallel circuit (31) are also electrically connected with a reference voltage circuit.
7. The security management and control terminal according to claim 6, characterized in that: the reference voltage circuit comprises a second voltage follower U2, the input end of the second voltage follower U2 is electrically connected with a third resistor R3, and the other end of the third resistor R3 is electrically connected with a power supply; the connection point of the third resistor R3 and the second voltage follower U2 is electrically connected with a fourth resistor R4, and the other end of the fourth resistor R4 is grounded.
8. The security management and control terminal according to claim 7, characterized in that: the positive power end of the second voltage follower U2 is electrically connected with a second capacitor C2, and the connection point of the second capacitor C2 and the second voltage follower U2 is used for connecting a power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021949221.0U CN213023313U (en) | 2020-09-08 | 2020-09-08 | Safety control terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021949221.0U CN213023313U (en) | 2020-09-08 | 2020-09-08 | Safety control terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213023313U true CN213023313U (en) | 2021-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021949221.0U Active CN213023313U (en) | 2020-09-08 | 2020-09-08 | Safety control terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213023313U (en) |
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2020
- 2020-09-08 CN CN202021949221.0U patent/CN213023313U/en active Active
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