CN115755708A - Multi-loop comprehensive measurement and control device and method - Google Patents

Abstract

The invention relates to a multi-loop comprehensive measurement and control device and a method, which comprises a circuit board positioned in an outer shell, wherein a microcontroller and a plurality of interface pieces are arranged on the circuit board, each interface piece comprises two input ports, two ports of each interface piece are respectively connected to a communication port of the microcontroller through an isolation circuit, one port of each interface piece is electrically connected together, two output ends of one half of the interface pieces which pass through the isolation circuit are connected into the microcontroller in a forward direction, and two output ends of the other half of the interface pieces which pass through the isolation circuit are connected into the microcontroller in a reverse direction. The invention discloses a multi-loop comprehensive measurement and control device and a method, which can be applied to large-current occasions.

Description

Multi-loop comprehensive measurement and control device and method

Technical Field

The invention relates to a multi-loop comprehensive measurement and control device and method, and belongs to the technical field of electric power.

Background

At present, in the industries such as submerged arc furnaces and the like, measurement and control devices are required to measure a plurality of loops of electrical equipment and monitor parameters, so that switching on and off are controlled through specific logic. Therefore, the measurement and control device needs to be provided with a plurality of groups of interface circuits, the number of the required loops is matched, two output ends of a mutual inductor of each loop are respectively connected with two input ends of each group of interfaces during wiring, the mutual inductors of each loop are in one-to-one correspondence during wiring, and otherwise, measurement is not accurate. However, in actual operation, the situation that wiring does not correspond frequently occurs, so that monitoring data is invalid, for this reason, enterprises begin to consider combining multiple groups of interfaces, that is, one input end of each group of interfaces is connected to a bus, so that after one of two output ends of the mutual inductor is sequentially inserted into one input end of the interface during wiring each time, the other output end is randomly inserted into any one port connected together, and therefore wiring operation is simplified. However, in practical applications, although the above-mentioned method simplifies the wiring method, the current at the common terminal is large because the multi-circuits share one bus, and thus the method cannot be applied to a large current situation. Therefore, it is necessary to make corresponding improvements to match the large current application occasions of the submerged arc furnace and other industries.

Disclosure of Invention

The invention aims to overcome the defects, provides a multi-loop comprehensive measurement and control device and method which can be applied to large-current occasions, and the volume of the device is smaller through an integrated structure.

The purpose of the invention is realized as follows:

the utility model provides a measurement and control device is synthesized to multiloop, include the circuit board that is located the shell, be provided with microcontroller and a plurality of interface spare on the circuit board, every interface spare includes two input ports, two ports of each interface spare are connected to microcontroller's ADC input port behind the buffer circuit respectively, the port electricity of the same kind of a plurality of interface spares links together, half interface spare is through two output forward access microcontroller behind the buffer circuit, two output backward access microcontroller behind the buffer circuit of half interface spare.

Preferably, the isolation circuit includes a mutual inductor, two input ends of the mutual inductor are respectively connected with two paths of ports of the interface, the output end of the mutual inductor outputs two output ends after passing through the filter circuit, namely, the first output end and the second output end of one half of the isolation circuit are directly connected into the microcontroller, and the first output end and the second output end of the other half of the isolation circuit are crossed and then connected into the microcontroller.

Preferably, the plurality of interface pieces are integrated into a junction box, one ports of the plurality of interface pieces are divided into two groups and are respectively arranged at two ends of the junction box, and the other ports of the plurality of interface pieces are positioned in the middle of the junction box and are convenient for centralized connection.

A multi-loop comprehensive measurement and control method is characterized in that primary mutual inductors are sleeved on a plurality of loops to be measured respectively, one half of the primary mutual inductors are sleeved in a forward direction, the other half of the primary mutual inductors are sleeved in a reverse direction, one output end of two output ends of all the primary mutual inductors is connected to a corresponding wiring port respectively, the other output ends of all the primary mutual inductors are connected to the wiring ports which are combined together, the mutual inductors are divided into a forward and reverse two-group sleeving structure, so that induced currents of the primary mutual inductors are mutually offset on the wiring ports which are combined and connected, and the current value is reduced; meanwhile, the measuring signal input by the primary mutual inductor sleeved in the forward direction passes through the isolating circuit and then is input into the microcontroller in the forward direction, and the measuring signal input by the primary mutual inductor sleeved in the reverse direction passes through the isolating circuit and then is input into the microcontroller in the cross and reverse direction, so that the signal is turned over again to ensure the measuring accuracy. Namely: namely: for the interface part of the multi-loop comprehensive measurement and control device, a secondary mutual inductor is used for secondary isolation correspondingly inside the multi-loop comprehensive measurement and control device. Corresponding to an external forward sleeving loop, an internal forward connection is adopted; meanwhile, the inside of the corresponding outside reverse sleeved device is connected in reverse, so that the accuracy of measuring multifunctional electric quantity is guaranteed while the wiring current reduction is guaranteed.

Compared with the prior art, the invention has the beneficial effects that:

the external reverse mutual inductor enables the currents after the cascade connection to be mutually offset while connecting the interface pieces to facilitate the insertion, thereby reducing the total current value and being beneficial to being applied to large-current monitoring occasions; meanwhile, after the signals input in the reverse connection mode are input in the internal mode, the signals input in the reverse connection mode are connected into the microcontroller in the same phase position again in the reverse connection mode to be processed, and therefore monitoring precision and accuracy are guaranteed. Simultaneously, through connecting a plurality of ports electricity in an organic whole to guarantee the signal flow direction through the line mode of walking alternately, need not to increase extra electrical part and can realize measuring the multichannel return circuit that awaits measuring simultaneously, compare with traditional single-circuit measurement, the mechanism volume of integrated form is more small and exquisite, is favorable to improving its range of application.

Drawings

Fig. 1 is an electrical circuit diagram of a multi-circuit comprehensive measurement and control device of the invention.

Fig. 2 is a schematic diagram of a main circuit of the multi-circuit integrated measurement and control device of the present invention (in the diagram, an electrical identifier is marked at the end of a circuit, and the corresponding electrical identifier is a phase connection end, which is estimated to be a schematic diagram of the whole circuit, and is not a schematic diagram of a plurality of mutually independent circuits).

Fig. 3 and fig. 4 are circuit diagrams of six isolation circuits in a multi-loop comprehensive measurement and control device according to the invention.

Fig. 5 and fig. 6 are circuit diagrams of two groups of microcontrollers in a multi-loop comprehensive measurement and control device according to the invention.

Detailed Description

Referring to 1~6, the invention relates to a multi-loop comprehensive measurement and control device and method, which comprises a circuit board located in an outer shell, wherein two sets of microcontrollers, the model number of which is RN7302, are arranged on the circuit board, and each set of microcontrollers respectively receives signals provided by three loops, and can simultaneously receive six loops in total.

Six groups of interface components are embedded on the panel of the outer shell, such as an interface component I (I1, ICOM 1), an interface component II (I2, ICOM 2), an interface component III (I3, ICOM 3), an interface component IV (I4, ICOM 4), an interface component V (I5, ICOM 5) and an interface component VI (I6, ICOM 6) shown in the figure; and the six groups of interface components are all inserted on the circuit board, meanwhile, the ICOM1, ICOM2, ICOM3, ICOM4, ICOM5 and ICOM6 terminals of the six groups of interface components are connected together, can be connected together through copper foil wiring on the circuit board, also can be connected together by welding after being close to each other through physical layout, and two terminals of each group of interface components input signals into the microcontroller after passing through the isolation circuit respectively. The isolation circuit comprises a secondary mutual inductor and an amplitude limiting low-pass filter circuit, wherein the output end of the primary mutual inductor generates an induced current after passing through the secondary mutual inductor, and the induced current is input into the microcontroller after being filtered by the amplitude limiting low-pass filter circuit. Wherein, the secondary transformer is a high-precision micro current transformer, and the model number of the secondary transformer is ZEMCT131; the amplitude limiting low-pass filter circuit is composed of high-frequency switching diodes, and is in a model number of 4148.

In order to match a portable plug-in matching structure formed by connecting the terminals of the interface component together, the current generated after the six groups of circuits are collected by the primary transformers needs to be reduced, at the moment, a plurality of adjacent primary transformers are reversely connected, namely as shown in figure 1, in CT1, CT2, CT3, CT4, CT5 and CT6 serving as the primary transformers, the CT1, CT3 and CT5 are sleeved on the cable of the circuit to be detected in the forward direction, and the CT2, CT4 and CT6 are sleeved on the cable of the circuit to be detected in the reverse direction, so that the current phase difference of the input interface components of the adjacent primary transformers is 180 degrees, at the moment, after the six terminals of the interface components are combined together, the adjacent reverse currents are mutually counteracted, the overall current value on the input interface components is greatly reduced, and therefore, the portable plug-in matching structure can be safely and reliably applied to a large-flow environment.

And, correspondingly matching with it, because CT2, CT4 and CT6 adopt the reverse socket joint way, in order to guarantee the accuracy of the monitoring numerical value, when the current value six ways of isolating circuits of the primary mutual inductor led in by the interface unit are outputted, namely the first way (IAN, LAP), the third way (ICN, LCP) and the fifth way (IB 2N, LB P) are directly inputted into the corresponding ports of the microcontroller, the other three ways are reversely connected to form the second way (IBP, LBN), the fourth way (IA 2P, LA N) and the sixth way (IC 2P, LC N) and then inputted into the corresponding ports of the microcontroller, thereby the phases of the three ways are turned over 180 ° again through the data current input after the isolating circuits, thereby guaranteeing that the phases of the six ways are the same.

Furthermore, in order to facilitate the connection of the customers, the physical implementation structure of the six interface components is redesigned, the six interface components are integrated into a terminal box, the terminal box is embedded on the outer shell, and 12 connection terminals, namely 12 terminals (I1, ICOM 1), (I2, ICOM 2), (I3, ICOM 3), (I4, ICOM 4), (I5, ICOM 5) and (I6, ICOM 6) constituting the six interface components are arranged in the terminal box, and are rearranged, so that the terminals (I1, I2, I3) and (I4, I5, I6) are divided into two groups and are respectively arranged at two ends of the terminal box, and the terminals (ICOM 1, ICOM2, ICOM3, ICOM4, ICOM5, ICOM 6) are positioned in the middle of the terminal box, namely the six terminals (ICOM 1, ICOM2, ICOM3, ICOM4, ICOM5, ICOM 6) are positioned between the six terminals (ICOM 1, ICOM2, ICOM3, ICOM4, ICOM5, ICOM 6) and are positioned at two groups of terminals (ICOM 1, ICOM2, ICOM3, ICOM 6) so as to facilitate the connection of the customers and the customers.

During wiring operation, an operator can conveniently operate without looking at the junction box, only one output line of the six primary transformers is inserted into the six terminals at two ends, and the other output line is inserted into any one of the six terminals (ICOM 1, ICOM2, ICOM3, ICOM4, ICOM5 and ICOM 6) immediately, so that the wiring operation difficulty is greatly simplified.

This is described in more detail below in conjunction with FIG. 2~6:

i1 and ICOM1 of the first interface piece are respectively connected to Ia1 and IA1 of the first isolation circuit;

the two interfaces I2 and ICOM2 are connected to Ib1 and Ib1 of the second isolation circuit, respectively;

the interface pieces three I3 and ICOM3 are connected to Ic1 and Ic1 of the third isolation circuit, respectively;

the interfaces four I4 and ICOM4 are connected to Ia2 and Ia2, respectively, of the fourth isolation circuit;

the interfaces five I5 and ICOM5 are connected to Ib2 and Ib2 of the fifth isolation circuit, respectively;

the interfaces six I6 and ICOM6 are connected to Ic2 and Ic2 of the sixth isolation circuit, respectively;

the first isolation circuit, the second isolation circuit, the third isolation circuit, the fourth isolation circuit, the fifth isolation circuit and the sixth isolation circuit are of the same circuit structure, and are described by being collectively called as isolation circuits below:

the isolation circuit comprises a secondary transformer, the input ends of the secondary transformer are (Ia 1 and IA 1) (Ib 1 and IB 1) (Ic 1 and IC 1) (Ia 2 and IA 2) (Ib 2 and IB 2) and (Ic 2 and IC 2), namely a No. 1 pin and a No. 2 pin of the ZEMCT131 type transformer, two high-frequency switch diodes are connected between two output ends of the secondary transformer, the two output ends of the secondary transformer are grounded through an RC filter circuit for filtering, and meanwhile, the two output ends of the secondary transformer are respectively used as output ends to be connected with the microcontroller; specifically, the method comprises the following steps:

the output of the No. 3 pin of the secondary transformer of the first isolation circuit is used as an output end IAP, and the output of the No. 4 pin is used as an output end IAN;

the output of the No. 3 pin of the secondary transformer of the second isolation circuit is used as an output end IBN, and the output of the No. 4 pin is used as an output end IBP;

the output of the No. 3 pin of the secondary transformer of the third isolating circuit is used as an output end ICP, and the output of the No. 4 pin is used as an output end ICN;

the output of the No. 3 pin of the secondary transformer of the fourth isolating circuit is used as an output end IA2N, and the output of the No. 4 pin is used as an output end IA2P;

the output of the No. 3 pin of the secondary transformer of the fifth isolating circuit is used as an output end IB2P, and the output of the No. 4 pin is used as an output end IB2N;

the output of the No. 3 pin of the secondary transformer of the sixth isolating circuit is used as an output end IC2N, and the output of the No. 4 pin is used as an output end IC2P;

thereby realizing the reverse connection of the adjacent output ends, namely half of the output ends are connected in the positive direction and half of the output ends are connected in the reverse direction;

then IAP and IAN of the first isolation circuit, IBN and IBP of the second isolation circuit and ICP and ICN of the third isolation circuit are respectively input into pins 1 and 2, pins 5 and 4 and pins 7 and 8 of the first microcontroller U1;

the IA2N and IA2P of the fourth isolation circuit, the IB2P and IB2N of the fifth isolation circuit, and the IC2N and IC2P of the sixth isolation circuit are input to pins 2 and 1, pins 4 and 5, and pins 8 and 7, respectively, of the second microcontroller U2.

The output signal after passing through the isolation circuit is received by the first microcontroller U1 and the second microcontroller U2.

In addition: it should be noted that the above-mentioned embodiment is only a preferred embodiment of the present patent, and any modification or improvement made by those skilled in the art based on the above-mentioned conception is within the protection scope of the present patent.

Claims (4)

1. The utility model provides a measurement and control device is synthesized to multiloop, includes the circuit board that is located the shell, is provided with microcontroller and a plurality of interface spare on the circuit board, and every interface spare includes two input ports, and two ports of each interface spare are connected to microcontroller's communication port, its characterized in that after isolation circuit respectively:

one path of ports of the plurality of interface pieces are electrically connected together, two output ends of one half of the interface pieces passing through the isolation circuit are connected into the microcontroller in a forward direction, and two output ends of the other half of the interface pieces passing through the isolation circuit are connected into the microcontroller in a reverse direction.

2. The multi-loop comprehensive measurement and control device according to claim 1, characterized in that: the isolation circuit comprises a mutual inductor, two input ends of the mutual inductor are respectively connected with two paths of ports of the interface piece, two output ends of the output end of the mutual inductor are output through the filter circuit, namely an output end I and an output end II, the output end I and the output end II of one half of the isolation circuit are directly connected into the microcontroller, and the output end I and the output end II of the other half of the isolation circuit are connected into the microcontroller after crossing.

3. The multi-loop comprehensive measurement and control device according to claim 1 or 2, characterized in that: the plurality of interface pieces are integrated into a junction box, one end ports of the plurality of interface pieces are divided into two groups and are respectively arranged at two ends of the junction box, and the other end ports of the plurality of interface pieces are positioned in the middle of the junction box and are convenient for centralized connection.

4. A multi-loop comprehensive measurement and control method is characterized in that: half of the primary transformers on the loops to be tested are sleeved in a forward direction, the other half of the primary transformers are sleeved in a reverse direction, one output end of two output ends of all the primary transformers is connected to the corresponding wiring port, the other output ends of all the primary transformers are connected to the wiring port which is combined together, the transformers are divided into a forward group and a reverse group of sleeved structures, so that induced currents of the primary transformers are mutually offset on the combined and connected wiring port, and the current value is reduced; meanwhile, the measuring signal input by the primary mutual inductor sleeved in the forward direction passes through the isolating circuit and then is input into the microcontroller in the forward direction, and the measuring signal input by the primary mutual inductor sleeved in the reverse direction passes through the isolating circuit and then is input into the microcontroller in the cross and reverse direction, so that the signal is turned over again to ensure the measuring accuracy.

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