CN107991916A - A kind of automatic channel switching equipment - Google Patents

Abstract

The invention is an automatic channel switching device, which includes an output module, an input module, a main control module and a power switching module, which are connected to each other on the bottom plate, and the communication circuit in the main control module and the control The terminal communication feedback device access status to the intelligent control circuit, the connection state detection circuit completes the judgment of the device type through the voltage comparator, and the intelligent control circuit sends the device type judgment signal to the relay drive circuit to control the selection of the relay, and finally input the module The input signal switching circuit of the output module completes the selection of the corresponding equipment type signal group and connects it to the switching equipment, and the output signal switching circuit of the output module completes the selection of the corresponding equipment type signal group and transfers it out of the switching equipment, and finally completes one control terminal to control two A device with different functions but the same interface.

Description

An automatic channel switching device

technical field

The invention relates to the technical field of electronic information equipment, in particular to an automatic channel switching equipment.

Background technique

With the rapid development of electronic technology and computer technology, there are more and more electronic equipment and related control equipment, and in order to better meet the needs, these electronic equipment and related control equipment are constantly pursuing miniaturization, integration, and intelligence. At present, in large-scale control systems, there are usually two sets of terminal devices controlling two devices with different functions but the same interface. The use of two sets of terminal devices is costly, occupies a large space, and is difficult and costly to maintain, and does not meet the requirements of small size. Therefore, a kind of equipment is needed to solve this kind of problem now.

Contents of the invention

The object of the present invention is to provide an automatic channel switching device to solve the above problems.

An automatic channel switching device, comprising a base plate, on which an output module, an input module, a main control module and a power switching module connected to each other are arranged on the base plate; both the output module and the input module are relay modules, and the The relay modules are single-pole double-throw relays, the output module includes an output signal switching circuit, the input module includes an input signal switching circuit; the main control module includes an intelligent control circuit, a communication circuit, a relay drive circuit and a connected state detection circuit, the intelligent control circuit includes a single-chip microcomputer for intelligently controlling channel switching, the communication circuit includes a level conversion chip for communicating with external control terminal equipment and interacting with external equipment, and the relay drive circuit includes a chip, the connected state detection circuit includes a voltage comparator; the power switching module includes a power switching circuit.

In one of the embodiments, the microcontroller of the intelligent control circuit uses a microcontroller of model ATMEGA128.

In one of the embodiments, the communication circuit uses the RS232 serial port of the MAX232 level conversion chip as the device communication interface.

In one of the embodiments, the relay driving circuit adopts ULN2803 chip as the driving circuit of the relay.

In one of the embodiments, the voltage comparator includes an OP07 operational amplifier chip and a resistor divider circuit, and the microcontroller is connected in parallel with relay CHD0, relay CHD1, relay CHD2, relay CHD3, relay CHD4, and relay CHD5. The contacts of relay CHD0, relay CHD1, relay CHD2, relay CHD3, relay CHD4 and relay CHD5 are respectively connected to the voltage comparator.

In one of the embodiments, the OP07 operational amplifier chip is connected to the sliding rheostat RE0.

In one of the embodiments, the power switching circuit includes a single-pole double-throw high-power relay.

In summary, an automatic channel switching device includes an output module, an input module, a main control module and a power switching module, which are connected to each other on the bottom plate, and the communication circuit in the main control module is connected to the communication feedback device of the control terminal. input state to the intelligent control circuit, the connected state detection circuit completes the judgment of the device type through the voltage comparator, the intelligent control circuit sends the device type judgment signal to the relay drive circuit, thereby controlling the selection of the relay, and finally the input signal switching circuit of the input module Complete the selection of the corresponding device type signal group and connect it to the switching device. The output signal switching circuit of the output module completes the selection of the corresponding device type signal group and transfers it out of the switching device, and finally completes a control terminal to control two different functions but the same interface. device of.

Description of drawings

Fig. 1 is a schematic diagram of the internal structure of an embodiment of the present invention;

Fig. 2 is a functional block diagram of an embodiment of the present invention;

3 is a schematic diagram of an intelligent control circuit of a main control module according to an embodiment of the present invention;

4 is a schematic diagram of a communication circuit of a main control module according to an embodiment of the present invention;

5 is a schematic diagram of a relay drive circuit of the main control module according to an embodiment of the present invention;

6 is a schematic diagram of a connection state detection circuit of the main control module according to an embodiment of the present invention;

Fig. 7 is a schematic diagram of the working electrical circuit of the input module according to an embodiment of the present invention;

8 is a schematic diagram of an input signal switching circuit of an input module according to an embodiment of the present invention;

9 is a schematic diagram of an output module output signal switching circuit according to an embodiment of the present invention;

Fig. 10 is a schematic diagram of a power switching circuit of a power switching module according to an embodiment of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1-10, an automatic channel switching device includes a base plate, and the base plate is provided with an output module 1, an input module 2, a main control module 3 and a power switching module 4 that are connected to each other; Both the output module 1 and the input module 2 are relay modules, the relay modules are single-pole double-throw relays, the output module 1 includes an output signal switching circuit, and the input module 2 includes an input signal switching circuit; the main The control module 3 includes an intelligent control circuit, a communication circuit, a relay drive circuit and a connected state detection circuit. The intelligent control circuit includes a single-chip microcomputer for intelligently controlling channel switching. An interactive level conversion chip, the relay driving circuit includes a chip for driving a relay, the connection state detection circuit includes a voltage comparator; the power switching module 4 includes a power switching circuit.

As shown in Figure 2, the communication circuit in the main control module 3 communicates with the control terminal to feed back the access state of the device to the intelligent control circuit. The signal is sent to the relay drive circuit to control the selection of the relay. Finally, the input signal switching circuit of the input module 2 completes the selection of the corresponding device type signal group and connects it to the switching device, and the output signal switching circuit of the output module 1 completes the corresponding device type. The signal group is selected and transferred to the switching device, and finally one control terminal controls two devices with different functions but the same interface.

As shown in FIG. 3 , in one of the embodiments, the microcontroller of the intelligent control circuit uses a model ATMEGA128 microcontroller. ATMEGA128 has the characteristics of high stability and wide application. It uses ATMEGA128 microcontroller as the core controller to realize the intelligent control of channel switching equipment.

As shown in FIG. 4, in one embodiment, the communication circuit uses the RS232 serial port of the MAX232 level conversion chip as the device communication interface. The channel switching device uses the RS232 serial port of the MAX232 level conversion chip as the device communication interface to communicate with the external control terminal device to realize the data interaction between the channel switching device and the external device.

As shown in FIG. 5 , in one embodiment, the relay drive circuit uses a ULN2803 chip as the relay drive circuit. The channel switching device uses the ULN2803 chip as the drive circuit of the relay to realize the relay driving of the main control module 3, the input module 2, the output module 1, and the power switching module 4.

As shown in Figure 6, in one of the embodiments, the voltage comparator includes an OP07 operational amplifier chip and a resistor voltage divider circuit, and the microcontroller is connected in parallel with relay CHD0, relay CHD1, relay CHD2, relay CHD3, relay CHD4, relay CHD5, the contacts of the relay CHD0, relay CHD1, relay CHD2, relay CHD3, relay CHD4, and relay CHD5 are respectively connected to the voltage comparator. The connection state detection circuit is closed and disconnected in sequence with six groups of relays CHD0, CHD1, CHD2, CHD3, CHD4 and CHD5 connected in parallel through the voltage comparator, and the 6 groups of contacts in the access device interface are respectively connected to Voltage comparator, the 3rd pin of the OP07 operational amplifier is used as the voltage reference terminal, and the 2nd pin is used as the voltage input comparison terminal. After the relay is closed, if the contact is connected, the output of the 6th pin of the operational amplifier is high level. The output of pin 6 of the operational amplifier is low level, so as to achieve the detection of the connection state, and complete the judgment of the device type through different combinations of the connection state of the contacts.

In one of the embodiments, the OP07 operational amplifier chip is connected to the sliding rheostat RE0. Relay CHD0, relay CHD1, relay CHD2, relay CHD3, relay CHD4, and relay CHD5 controlled by the microcontroller are closed and disconnected in turn, and the 6 groups of contacts in the access device interface are respectively connected to the voltage comparator, and the OP07 op amp Pin 3 is used as a voltage reference terminal, and the voltage reference threshold can be adjusted through the sliding rheostat RE0.

As shown in FIG. 10 , in one embodiment, the power switching circuit includes a single-pole double-throw high-power relay. The use of single-pole double-throw high-power relays can meet the power supply requirements of different devices. At the same time, the power switching circuit completes the control of the power supply and power-off of the type of equipment.

As shown in FIG. 7 , the working power circuit of the input module 2 provides power for the operation of the internal board module of the channel switching device.

As shown in FIG. 8 , the input signal switching circuit of the input module 2 completes the selection of the corresponding device type signal group and connects it to the switching device.

As shown in FIG. 9 , the output signal switching circuit of the output module 1 completes the selection of the signal group corresponding to the device type and transfers it out of the switching device.

The technical solution is composed of four circuit modules, including a main control module 3, an input module 2, an output module 1, and a power switching module 4, which are connected through a backplane. The main control module 3 includes the RS-232 communication function, which is responsible for communicating with the control terminal to feed back the access status of the device; the connectivity detection function, which is responsible for detecting the type of the access device; the relay control function, which is responsible for controlling the input module 2 and the output module 1, and will The signal transmission channel corresponding to the device type is switched on. The input module 2 and the output module 1 are relay modules, both of which are single-pole double-throw relays, controlled by the main control module 3, and the input signal channel and the output signal channel are connected through the backplane by using the input module 2 and the output module 1 to complete Turn on the control signal. The power switching module 4 adopts a single-pole double-throw high-power relay to meet the power supply requirements for connecting different devices. Through the combined use of four circuit modules in the device, one control terminal controls two devices with different functions but the same interface, so as to reduce the cost of the control system and meet the goals of miniaturization, integration and intelligence.

The above is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications made by those skilled in the art within the field of the present invention are covered by the patent scope of the present invention Inside.

Claims (7)

1. A kind of 1. automatic channel switching equipment, it is characterised in that：It is provided with what is mutually connected including bottom plate, on the bottom plate Output module, input module, main control module and power supply handover module；The output module and the input module are relay Module, the relay module are single-pole double-throw relay, and the output module includes output signal switching circuit, described defeated Entering module includes input signal switching circuit；The main control module includes intelligent control circuit, telecommunication circuit, relay driving electricity Road and connected state detection circuit, the intelligent control circuit includes switching passage the microcontroller for carrying out intelligent control, described Telecommunication circuit includes the electrical level transferring chip for carrying out communication with external control terminal equipment and external equipment interacts, the relay Drive circuit includes the chip being driven to relay, and the connected state detection circuit includes voltage comparator；The electricity Source handover module includes power supply switch circuit.
2. A kind of 2. automatic channel switching equipment according to claim 1, it is characterised in that：The monolithic of the intelligent control circuit Machine uses the microcontroller of model ATMEGA128.
3. A kind of 3. automatic channel switching equipment according to claim 1, it is characterised in that：The telecommunication circuit uses MAX232 The RS232 serial ports of electrical level transferring chip is as device communication interface.
4. A kind of 4. automatic channel switching equipment according to claim 1, it is characterised in that：The relay drive circuit uses Drive circuit of the ULN2803 chips as relay.
5. A kind of 5. automatic channel switching equipment according to claim 2, it is characterised in that：The voltage comparator includes OP07 Amplifier chip and resistor voltage divider circuit, microcontroller connection relay CHD0 in parallel, relay CHD1, relay CHD2, relay CHD3, relay CHD4, relay CHD5, the relay CHD0, relay CHD1, relay CHD2, after Electric appliance CHD3, relay CHD4, the contact of relay CHD5 are respectively connected to voltage comparator.
6. A kind of 6. automatic channel switching equipment according to claim 5, it is characterised in that：The OP07 amplifier chips connection is slided Dynamic rheostat RE0.
7. A kind of 7. automatic channel switching equipment according to claim 1, it is characterised in that：The power supply switch circuit includes single Dpdt double-pole double-throw (DPDT) high power relay.