CN204046638U - For the CAN communication circuit of welding equipment - Google Patents
For the CAN communication circuit of welding equipment Download PDFInfo
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- CN204046638U CN204046638U CN201420469314.1U CN201420469314U CN204046638U CN 204046638 U CN204046638 U CN 204046638U CN 201420469314 U CN201420469314 U CN 201420469314U CN 204046638 U CN204046638 U CN 204046638U
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Abstract
A kind of CAN communication circuit for welding equipment, comprise: main control chip, digital buffer circuit, CAN transmission circuit, DC-DC insulating power supply circuit and lightning protection circuit, main control chip, there is two paths of signals output, the two paths of signals input of digital buffer circuit connects the two paths of signals output of main control chip, TXD pin and the RXD pin of CAN transmission circuit are connected the two paths of signals output of digital buffer circuit respectively, lightning protection circuit, connect the signal output part of CAN transmission circuit, the signal output part of lightning protection circuit is connected to CAN interface.The utility model is by DC-DC insulating power supply circuit and digital buffer circuit, and isolated the electrical connection of CAN interface and main control chip, system is more stable.Lightning protection circuit can effectively reduce thunder and lightning in life and electrostatic interference, bus circuit and communication chip are effectively protected, are specially adapted to the arc welding equipment field that transmission line is exposed to open air, long range propagation usually.
Description
Technical field
The utility model relates to field of welding devices, particularly relates to a kind of CAN communication circuit for welding equipment.
Background technology
At present, welding equipment is used in a large number in the engineering construction of China, this welding equipment is generally made up of the source of welding current and wire-feed motor two parts, and each funtion part control system is generally adopt analog signal transmission, the advantage of analog signal transmission is directly perceived and easily realizes, but there are two major defects: one is that transmission range is short, and transmission information amount is few, and confidentiality is poor; Two is that antijamming capability is weak, the signal of telecommunication is extraneous with various noise jamming that are communication system inside along being subject in the transmitting procedure of circuit, be difficult to separately after noise and signal mixing, thus communication quality is declined, circuit is longer, the accumulation of noise is also more, and welding equipment easily receives the impact of interference signal and damages, thus causes the reliability of equipment to reduce and maintenance cost raising.
Utility model content
Based on this, be necessary short for transmission range in conventional art, that antijamming capability is weak technical problem, the CAN communication circuit for welding equipment that a kind of transmission range is long, antijamming capability is strong is provided.
For a CAN communication circuit for welding equipment, comprising:
Main control chip, has two paths of signals output;
Digital buffer circuit, its two paths of signals input connects the two paths of signals output of described main control chip;
CAN transmission circuit, its TXD pin and RXD pin are connected the two paths of signals output of described digital buffer circuit respectively;
DC-DC insulating power supply circuit, its power input connects the power input of described digital buffer circuit, and its power output end connects the power input of described CAN transmission circuit;
Lightning protection circuit, connects the signal output part of described CAN transmission circuit, and the signal output part of described lightning protection circuit is connected to CAN interface.
In one of them embodiment, described digital buffer circuit comprises a two-channel digital formula isolator, resistance R4 and resistance R5, described resistance R4 and one end of resistance R5 are connected a road signal output part of described main control chip respectively, and described resistance R4 and the other end of resistance R5 are connected a road signal input part of described two-channel digital formula isolator respectively.
In one of them embodiment, described two-channel digital formula isolator is ADUM1201 chip.
In one of them embodiment, described CAN transmission circuit comprises a CAN transceiver chip and resistance R6, resistance R7, resistance R8 and resistance R9, described resistance R6 and one end of resistance R7 are connected described two-channel digital formula isolator one road signal output part respectively, described resistance R6 is connected the RXD pin of described CAN transceiver chip with the other end of resistance R7, one end of described resistance R8 connects the power output end of described DC-DC insulating power supply circuit, the other end of described resistance R8 connects the reference voltage V REF pin of described CAN transceiver chip, one end of described resistance R9 connects the power output end of described DC-DC insulating power supply circuit respectively, the other end of described resistance R9 connects the RS pin of CAN transceiver chip.
In one of them embodiment, described CAN transceiver chip is SN65HVD234 chip.
In one of them embodiment, described two-channel digital formula isolator ADUM1201 chip.
In one of them embodiment, described lightning protection circuit comprises transformer L1, ceramic discharge tube GDT1, GDT2, GDT3, Inrush current restraining device PPTC1, PPTC2, Transient Suppression Diode Q1, Q2, filter capacitor C6, C7 and terminal resistance R3, two Same Name of Ends of described transformer L1 connect communication signal high level pin and the communication signal low level pin of described CAN transmission circuit respectively, two other output of described transformer L1 also meets described Transient Suppression Diode Q1, Transient Suppression Diode Q2, terminal resistance R3, the series arm of described ceramic discharge tube GDT1 and ceramic discharge tube GDT2, ceramic discharge tube GDT3, described ceramic discharge tube GDT1 and ceramic discharge tube GDT2 indirectly.
The above-mentioned CAN communication circuit for welding equipment is by DC-DC insulating power supply circuit and digital buffer circuit, and isolated the electrical connection of CAN interface and main control chip, system is more stable.Described lightning protection circuit can effectively reduce thunder and lightning in life and electrostatic interference, effectively protects, be specially adapted to the arc welding equipment field that transmission line is exposed to open air, long range propagation usually to bus circuit and communication chip.
Accompanying drawing explanation
Fig. 1 is the circuit module figure of the CAN communication circuit for welding equipment of an execution mode;
Fig. 2 is the circuit theory diagrams of the CAN communication circuit for welding equipment shown in Fig. 1;
Description of reference numerals is as follows:
10 for the CAN communication circuit of welding equipment,
100 main control chips, 200 digital buffer circuits, 300CAN transmission circuit, 400DC-DC insulating power supply circuit, 500 lightning protection circuits.
Embodiment
For the ease of understanding the utility model, below with reference to relevant drawings, the utility model is described more fully.Preferred embodiment of the present utility model is given in accompanying drawing.But the utility model can realize in many different forms, is not limited to embodiment described herein.On the contrary, provide the object of these embodiments be make the understanding of disclosure of the present utility model more comprehensively thorough.
It should be noted that, when element is called as " being fixed on " another element, directly can there is element placed in the middle in it on another element or also.When an element is considered to " connection " another element, it can be directly connected to another element or may there is centering elements simultaneously.Term as used herein " vertical ", " level ", "left", "right" and similar statement are just for illustrative purposes.
Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present utility model understand usually.The object of the term used in specification of the present utility model herein just in order to describe specific embodiment, is not intended to be restriction the utility model.Term as used herein " and/or " comprise arbitrary and all combinations of one or more relevant Listed Items.
Refer to Fig. 1, a kind of CAN communication circuit for welding equipment of the present embodiment, it is a kind of CAN communication circuit being applicable to arc welding equipment based on the CAN technology of chip SN65HVD234, insulating power supply and bus lightning protection.Comprise: main control chip 100, digital buffer circuit 200, CAN transmission circuit 300, DC-DC insulating power supply circuit 400 and lightning protection circuit 500.
Main control chip 100 has two paths of signals output.This main control chip 100 adopts the dsp chip of TI company 2000 series, is one of state-of-the-art processor of current control field, and its operating frequency, up to 150MHz, substantially increases the control precision of control system and the ability of real-time processing information.
The two paths of signals input of digital buffer circuit 200 connects the two paths of signals output of described main control chip 100.Described digital buffer circuit 200 comprises a two-channel digital formula isolator U2, resistance R4 and resistance R5.This two-channel digital formula isolator U2 is ADUM1201 chip.Described resistance R4 and one end of resistance R5 are connected road signal output part C, D for described main control chip 100 respectively, and port D is data receiver CANRX, for controlling transponder chip U3 data receiver; Port C is data sending terminal CANTX, sends for controlling transponder chip U3 data.Described resistance R4 and the other end of resistance R5 are connected a road signal input part of described two-channel digital formula isolator U2 respectively.Current-limiting resistance R4, R5 have been the effects of current-limiting protection two passage digital buffer circuit 200 chip U2.
TXD pin and the RXD pin of CAN transmission circuit 300 are connected the two paths of signals output of described digital buffer circuit 200 respectively.Described CAN transmission circuit 300 comprises a CAN transceiver chip and resistance R6, resistance R7, resistance R8 and resistance R9, described resistance R6 and one end of resistance R7 are connected described two-channel digital formula isolator U2 mono-road signal output part respectively, described resistance R6 is connected the RXD pin of described CAN transceiver chip with the other end of resistance R7, one end of described resistance R8 connects the power output end of described DC-DC insulating power supply circuit 400, the other end of described resistance R8 connects the reference voltage V REF pin of described CAN transceiver chip, one end of described resistance R9 connects the power output end of described DC-DC insulating power supply circuit 400 respectively, the other end of described resistance R9 connects the RS pin of CAN transceiver chip.Current-limiting resistance R6, R7 have been the effects of current-limiting protection CAN transceiver chip U3.One end of resistance R8 is connected to the 5th pin VREF of CAN transceiver chip U3, and another termination power VCC2 of resistance R8, works in non-sleep pattern for making CAN transceiver chip U3; One end of resistance R9 is connected to the 8th pin RS of CAN transceiver chip U3, the other end ground connection of resistance R9, works in fast mode for making CAN transceiver chip selection.
DC-DC insulating power supply circuit 400, its power input connects the power input of described digital buffer circuit 200, and its power output end connects the power input of described CAN transmission circuit 300;
Lightning protection circuit 500, connects the signal output part of described CAN transmission circuit 300, and the signal output part of described lightning protection circuit 500 is connected to CAN interface.Described lightning protection circuit 500 comprises transformer L1, ceramic discharge tube GDT1, GDT2, GDT3, Inrush current restraining device PPTC1, PPTC2, Transient Suppression Diode Q1, Q2, filter capacitor C6, C7 and terminal resistance R3, two Same Name of Ends of described transformer L1 connect communication signal high level pin and the communication signal low level pin of described CAN transmission circuit 300 respectively, two other output of described transformer L1 also meets described Transient Suppression Diode Q1, Transient Suppression Diode Q2, terminal resistance R3, the series arm of described ceramic discharge tube GDT1 and ceramic discharge tube GDT2, ceramic discharge tube GDT3, described ceramic discharge tube GDT1 and ceramic discharge tube GDT2 indirectly.Described ceramic discharge tube GDT1, GDT2, GDT3 are the devices that can bear macro-energy thunderbolt, as one-level protection, thunderbolt voltage can be impaired to hundreds of volt left and right greatly; Ceramic discharge tube DC breakdown voltage is greater than the normal working voltage in circuit, and what ceramic discharge tube allowed is exceeded by electric current or equal to design the maximum current passed through; Ceramic discharge tube GDT1, GDT2 do common mode protection, and ceramic discharge tube GDT3 does differential mode protection; Described Inrush current restraining device PPTC1, PPTC2 are for limitting wave, and its maximum rated operating voltage should be greater than the normal maximum working voltage of circuit, and IH keeps electric current to be greater than maximum operating currenbt, and IT operating current should be less than the maximum of circuit and bear electric current.Described Transient Suppression Diode Q1, Q2 do secondary protection, i.e. secondary pressure limiting, makes the voltage of back-end circuit be clamped at about 8V, thus realize the protection to back-end circuit; Transient Suppression Diode Q2 does common mode protection, and Transient Suppression Diode Q1 does differential mode protection; The puncture voltage VBR of Transient Suppression Diode higher than the signal voltage that holding wire transmits, should put before this, and VBR should select lower as far as possible, and lower VBR can make back end communications chip obtain reliably protecting, and has larger discharge capacity; Described filter capacitor C6, C7 strobe, for filtering High-frequency Interference; The effect of described terminal resistance R3 is the signal reflex eliminated in communication cable, CAN should at the starting end of bus cable and end and connect terminal resistance, terminal resistance R3 general value 120 Ω, be equivalent to the resistance of the impedance of cable properties, because the characteristic impedance of twisted-pair cable is greatly between 100 Ω ~ 120 Ω mostly.
The above-mentioned CAN communication circuit for welding equipment is by DC-DC insulating power supply circuit 400 and digital buffer circuit 200, and the completely isolated electrical connection of CAN interface and main control chip 100, system is more stable.Described lightning protection circuit 500 can effectively reduce thunder and lightning in life and electrostatic interference, effectively protects, be specially adapted to the arc welding equipment field that transmission line is exposed to open air, long range propagation usually to bus circuit and communication chip.
The above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (7)
1. for a CAN communication circuit for welding equipment, it is characterized in that, comprising:
Main control chip, has two paths of signals output;
Digital buffer circuit, its two paths of signals input connects the two paths of signals output of described main control chip;
CAN transmission circuit, its TXD pin and RXD pin are connected the two paths of signals output of described digital buffer circuit respectively;
DC-DC insulating power supply circuit, its power input connects the power input of described digital buffer circuit, and its power output end connects the power input of described CAN transmission circuit;
Lightning protection circuit, connects the signal output part of described CAN transmission circuit, and the signal output part of described lightning protection circuit is connected to CAN interface.
2. the CAN communication circuit for welding equipment according to claim 1, it is characterized in that, described digital buffer circuit comprises a two-channel digital formula isolator, resistance R4 and resistance R5, described resistance R4 and one end of resistance R5 are connected a road signal output part of described main control chip respectively, and described resistance R4 and the other end of resistance R5 are connected a road signal input part of described two-channel digital formula isolator respectively.
3. the CAN communication circuit for welding equipment according to claim 2, is characterized in that, described two-channel digital formula isolator is ADUM1201 chip.
4. the CAN communication circuit for welding equipment according to claim 2, it is characterized in that, described CAN transmission circuit comprises a CAN transceiver chip and resistance R6, resistance R7, resistance R8 and resistance R9, described resistance R6 and one end of resistance R7 are connected described two-channel digital formula isolator one road signal output part respectively, described resistance R6 is connected the RXD pin of described CAN transceiver chip with the other end of resistance R7, one end of described resistance R8 connects the power output end of described DC-DC insulating power supply circuit, the other end of described resistance R8 connects the reference voltage V REF pin of described CAN transceiver chip, one end of described resistance R9 connects the power output end of described DC-DC insulating power supply circuit respectively, the other end of described resistance R9 connects the RS pin of CAN transceiver chip.
5. the CAN communication circuit for welding equipment according to claim 1, is characterized in that, described CAN transceiver chip is SN65HVD234 chip.
6. the CAN communication circuit for welding equipment according to claim 2, is characterized in that, described two-channel digital formula isolator is ADUM1201 chip.
7. the CAN communication circuit for welding equipment according to claim 2, it is characterized in that, described lightning protection circuit comprises transformer L1, ceramic discharge tube GDT1, GDT2, GDT3, Inrush current restraining device PPTC1, PPTC2, Transient Suppression Diode Q1, Q2, filter capacitor C6, C7 and terminal resistance R3, two Same Name of Ends of described transformer L1 connect communication signal high level pin and the communication signal low level pin of described CAN transmission circuit respectively, two other output of described transformer L1 also meets described Transient Suppression Diode Q1, Transient Suppression Diode Q2, terminal resistance R3, the series arm of described ceramic discharge tube GDT1 and ceramic discharge tube GDT2, ceramic discharge tube GDT3, described ceramic discharge tube GDT1 and ceramic discharge tube GDT2 indirectly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420469314.1U CN204046638U (en) | 2014-08-19 | 2014-08-19 | For the CAN communication circuit of welding equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420469314.1U CN204046638U (en) | 2014-08-19 | 2014-08-19 | For the CAN communication circuit of welding equipment |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553504A (en) * | 2016-01-15 | 2016-05-04 | 广州致远电子股份有限公司 | Isolated transceiver module and manufacturing method thereof |
| CN105576641A (en) * | 2016-03-02 | 2016-05-11 | 珠海格力电器股份有限公司 | CAN-BUS protection circuit and motion control system utilizing CAN-BUS protection circuit |
| CN106713097A (en) * | 2017-02-08 | 2017-05-24 | 广州致远电子股份有限公司 | CAN transmitting-receiving module |
| CN106950890A (en) * | 2017-04-28 | 2017-07-14 | 南京搜新智能科技有限公司 | Intelligent switching circuit based on double 485 communications |
| CN107591994A (en) * | 2017-09-20 | 2018-01-16 | 广州金升阳科技有限公司 | A kind of AC DC power modules of band CAN isolation EBI |
| CN107591995A (en) * | 2017-09-20 | 2018-01-16 | 广州金升阳科技有限公司 | A kind of AC DC power modules of band RS485 isolation EBI |
| CN109240164A (en) * | 2018-09-27 | 2019-01-18 | 希格斯动力科技（珠海）有限公司 | CAN bus isolation circuit, power panel and robot |
| CN111308933A (en) * | 2020-02-25 | 2020-06-19 | 广东省智能制造研究所 | Internet of things data acquisition system based on FPGA |
| CN116963417A (en) * | 2023-07-31 | 2023-10-27 | 杭州芯正微电子有限公司 | Ceramic packaging structure of digital isolator |
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2014
- 2014-08-19 CN CN201420469314.1U patent/CN204046638U/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553504A (en) * | 2016-01-15 | 2016-05-04 | 广州致远电子股份有限公司 | Isolated transceiver module and manufacturing method thereof |
| CN105576641A (en) * | 2016-03-02 | 2016-05-11 | 珠海格力电器股份有限公司 | CAN-BUS protection circuit and motion control system utilizing CAN-BUS protection circuit |
| CN106713097A (en) * | 2017-02-08 | 2017-05-24 | 广州致远电子股份有限公司 | CAN transmitting-receiving module |
| CN106713097B (en) * | 2017-02-08 | 2022-07-29 | 广州致远电子股份有限公司 | CAN transceiver module |
| CN106950890A (en) * | 2017-04-28 | 2017-07-14 | 南京搜新智能科技有限公司 | Intelligent switching circuit based on double 485 communications |
| CN107591994A (en) * | 2017-09-20 | 2018-01-16 | 广州金升阳科技有限公司 | A kind of AC DC power modules of band CAN isolation EBI |
| CN107591995A (en) * | 2017-09-20 | 2018-01-16 | 广州金升阳科技有限公司 | A kind of AC DC power modules of band RS485 isolation EBI |
| CN109240164A (en) * | 2018-09-27 | 2019-01-18 | 希格斯动力科技（珠海）有限公司 | CAN bus isolation circuit, power panel and robot |
| CN111308933A (en) * | 2020-02-25 | 2020-06-19 | 广东省智能制造研究所 | Internet of things data acquisition system based on FPGA |
| CN111308933B (en) * | 2020-02-25 | 2021-11-05 | 广东省智能制造研究所 | Internet of things data acquisition system based on FPGA |
| CN116963417A (en) * | 2023-07-31 | 2023-10-27 | 杭州芯正微电子有限公司 | Ceramic packaging structure of digital isolator |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Luo Minghong Inventor after: Xiong Gang Inventor after: Xing Minzhou Inventor after: Wang Ping Inventor before: Li Yi Inventor before: Xing Minzhou Inventor before: Kang Qingzhou |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: LI YI XING MINZHOU KANG QINGZHOU TO: LUO MINGHONG XIONG GANG XING MINZHOU WANG PING |