CN208691268U

CN208691268U - A kind of CAN communication modular circuit suitable for monitoring device

Info

Publication number: CN208691268U
Application number: CN201821360923.8U
Authority: CN
Inventors: 张成兵
Original assignee: Kunming Inpil Science & Technology Co Ltd
Current assignee: Kunming Inpil Science & Technology Co Ltd
Priority date: 2018-08-23
Filing date: 2018-08-23
Publication date: 2019-04-02
Anticipated expiration: 2028-08-23

Abstract

The utility model discloses a kind of CAN communication modular circuits suitable for monitoring device, including communication isolating chip U104, communication chip U103, isolated power supply U101, electrolytic capacitor CB100, capacitor C100, capacitor C101, capacitor C103, capacitor C104, capacitor C105, resistance R104, resistance R105, resistance R107.CAN communication modular circuit provided by the utility model realizes the completely isolated of input/output signal using communication isolating chip, realize that power supply is completely isolated using DCDC, realize being electrically isolated completely to for external communication and internal circuit, the signal of outside access will not influence the normal work of internal circuit completely, securely and reliably.

Description

A kind of CAN communication modular circuit suitable for monitoring device

Technical field

The utility model relates to fire fighting monitoring technical field, in particular to a kind of CAN communication mould suitable for monitoring device Block circuit.

Background technique

In recent years, with the development of society, monitoring device is increasingly widely used, including fire-fighting power supply monitoring Equipment, electrical fire monitoring device, fire resistant doorsets monitoring device etc..

There are the following problems for current monitoring device communicating circuit: internal circuit and external external circuits not electrically every From if outside, incoming communication signal easily interferes internal circuit if being interfered in application at the scene, makes communication signal not Stablize, situations such as communication goes offline occurs.

Utility model content

The problem of for above-mentioned background technique, the utility model provide that a kind of structure is simple, communication is good CAN communication modular circuit suitable for monitoring device.

The technical solution of the utility model are as follows:

A kind of CAN communication modular circuit suitable for monitoring device, including communication isolating chip U104, communication chip U103, isolated power supply U101, electrolytic capacitor CB100, capacitor C100, capacitor C101, capacitor C103, capacitor C104, capacitor C105, Resistance R104, resistance R105, resistance R107；No. 1 pin of the communication isolating chip U104 connects power vd D, the communication The CAN1RX signal end of No. 2 pins connection single-chip microcontroller of isolating chip U104, No. 2 pins of the communication isolating chip U104 Connect the CAN1TX signal end of single-chip microcontroller, No. 4 pins ground connection of the communication isolating chip U104, the communication isolating chip No. 2 pins of No. 5 pin connecting communication chip U103 of U104, No. 6 pin connecting communications of the communication isolating chip U104 No. 1 pin of chip U103, No. 4 pins of No. 7 pin connecting communication chip U103 of the communication isolating chip U104, institute It states No. 8 pins of communication isolating chip U104 while connecting one end of capacitor C104, No. 3 pins of communication chip U103, isolation The other end of No. 4 pins, the anode of electrolytic capacitor CB100 and one end of capacitor C100 of power supply U101, the capacitor C104 connects Connect the ground terminal of isolated power supply, the 3 of the other end of the capacitor C100, the cathode of isolation capacitance CB100 and isolated power supply U101 Number pin and the ground terminal that isolated power supply is connected after connecing, No. 5 pins of the communication chip U103 connect resistance R107's simultaneously One end, one end of capacitor C103 and resistance R105 one end, the other end of the resistance R107 simultaneously connects the 6 of communication chip U103 Number pin is as output end CANL, the ground terminal of the other end connection isolated power supply of the capacitor C103, the resistance R105's The other end simultaneously connects No. 7 pins of communication chip U103 as output end CANH, No. 8 pins concatenation electricity of the communication chip U103 The ground terminal of isolated power supply is connected after resistance R104, No. 1 pin of the isolated power supply U101 connects power supply VCC, the isolation electricity No. 2 pins of source U101 are grounded, serial capacitance C101 between No. 1 pin and No. 2 pins of the isolated power supply U101.

Further, the model ADUM1201 of the communication isolating chip U104, the model of the communication chip U103 It is DC/DC isolated power supply for TJA1040, the isolated power supply U101.

The utility model has the beneficial effect that

CAN communication modular circuit provided by the utility model suitable for monitoring device, structure is simple, and communication is good；It adopts With Modular Structure Design, it is able to satisfy different field demands, can only collocation all the way should under lesser system application environment CAN communication circuit can allow the multichannel CAN communication circuit in biggish system application environment；And due to CAN communication electricity Road is completely independent using modularized design electrical connection, is not interfere with each other between multiple CAN communication circuits, any of them CAN all the way There are the communications that all will not influence other roads when problem for communicating circuit, it is ensured that the stable operation of system communication；At communications line end Protection component is equipped at son, the interference of external signal will not influence the normal work of internal circuit.

Detailed description of the invention

Fig. 1 is the circuit theory schematic diagram of the utility model.

Specific embodiment

Specific embodiment of the present utility model is described further with reference to the accompanying drawing.It should be noted that The explanation of these embodiments is used to help to understand the utility model, but does not constitute the restriction to the utility model.This Outside, technical characteristic involved in the various embodiments of the present invention described below is as long as they do not conflict with each other It can be combined with each other.

As shown in Figure 1:

Specifically, the model ADUM1201 of the communication isolating chip U104, the model of the communication chip U103 TJA1040, the isolated power supply U101 are DC/DC isolated power supply.

In Fig. 1, VDD refers to that the 3.3V voltage after isolation, VCC refer to that the 5V voltage after isolation, VCC_R are the 5V before being isolated Voltage.

Isolator GNDC and ground GND are electrically completely isolated.

Before isolation and isolation after voltage be electrically isolated completely to, the voltage disturbance before being isolated will not influence completely every Voltage from after.That is internal circuit is completely interference-free if if outside, access signal has electrical Interference.

Working principle:

In the utility model ,-No. 4 pins of No. 1 pin of the communication isolating chip U104 are isolation input end, and No. 5 are drawn - No. 8 pins of foot are isolation output end, No. 1 pin of the communication chip U103 and No. 4 pins for receiving communication isolated core The rs 232 serial interface signal after isolation of piece U104 output passes through the 6 of communication chip U103 after being translated into CAN bus signal Number pin and No. 7 pins outputs, are used for external on-site monitoring equipment；The isolated power supply U101 is electric with its No. 1 pin connection is crossed Source VCC is exported through its No. 4 pins to communication isolating chip U104's to isolated power supply VCC1 is obtained after power supply progress isolation processing No. 3 pins of No. 8 pins and communication chip U103；Described capacitor C100, C101, C104, C105 are between power supply and reference ground Filter capacitor, for filtering out High-frequency Interference.

CAN communication modular circuit provided by the utility model realizes the complete of input/output signal using communication isolating chip Full isolation realizes being electrically isolated completely to for external communication and internal circuit using isolated power supply, and the signal of outside access is completely not It will affect the normal work of internal circuit, securely and reliably.

The embodiments of the present invention is explained in detail in conjunction with attached drawing above, but the utility model is not limited to be retouched The embodiment stated.For a person skilled in the art, right in the case where not departing from the utility model principle and spirit These embodiments carry out a variety of change, modification, replacement and modification, still fall in the protection scope of the utility model.

Claims

1. a kind of CAN communication modular circuit suitable for monitoring device, including communication isolating chip U104, communication chip U103, Isolated power supply U101, electrolytic capacitor CB100, capacitor C100, capacitor C101, capacitor C103, capacitor C104, capacitor C105, resistance R104, resistance R105, resistance R107；It is characterized by: No. 1 pin of the communication isolating chip U104 connects power vd D, institute State the CAN1RX signal end of No. 2 pins connection single-chip microcontroller of communication isolating chip U104, No. 2 for communicating isolating chip U104 Pin connects the CAN1TX signal end of single-chip microcontroller, No. 4 pins ground connection of the communication isolating chip U104, the communication isolated core No. 6 pins connection of No. 2 pins of No. 5 pin connecting communication chip U103 of piece U104, the communication isolating chip U104 is logical Interrogate No. 1 pin of chip U103, No. 4 pins of No. 7 pin connecting communication chip U103 of the communication isolating chip U104, institute It states No. 8 pins of communication isolating chip U104 while connecting one end of capacitor C104, No. 3 pins of communication chip U103, isolation The other end of No. 4 pins, the anode of electrolytic capacitor CB100 and one end of capacitor C100 of power supply U101, the capacitor C104 connects Connect the ground terminal of isolated power supply, the 3 of the other end of the capacitor C100, the cathode of isolation capacitance CB100 and isolated power supply U101 Number pin and the ground terminal that isolated power supply is connected after connecing, No. 5 pins of the communication chip U103 connect resistance R107's simultaneously One end, one end of capacitor C103 and resistance R105 one end, the other end of the resistance R107 simultaneously connects No. 6 of communication chip U103 Pin is as output end CANL, and the ground terminal of the other end connection isolated power supply of the capacitor C103, the resistance R105's is another One end simultaneously connects No. 7 pins of communication chip U103 as output end CANH, No. 8 pin series resistors of the communication chip U103 The ground terminal of isolated power supply is connected after R104, No. 1 pin of the isolated power supply U101 connects power supply VCC, the isolated power supply No. 2 pins of U101 are grounded, serial capacitance C101 between No. 1 pin and No. 2 pins of the isolated power supply U101.

2. the CAN communication modular circuit according to claim 1 suitable for monitoring device, it is characterised in that: the communication The model TJA1040, the isolated power supply U101 of the model ADUM1201, the communication chip U103 of isolating chip U104 For DC/DC isolated power supply.