CN203553923U - An intelligent protection circuit of a CAN transceiver - Google Patents
An intelligent protection circuit of a CAN transceiver Download PDFInfo
- Publication number
- CN203553923U CN203553923U CN201320656975.0U CN201320656975U CN203553923U CN 203553923 U CN203553923 U CN 203553923U CN 201320656975 U CN201320656975 U CN 201320656975U CN 203553923 U CN203553923 U CN 203553923U
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- transceiver
- circuit
- resettable fuse
- protection circuit
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Abstract
The utility model discloses an intelligent protection circuit of a CAN transceiver. The intelligent protection circuit comprises a terminal resistor, a common-mode signal suppression circuit, and a peak suppression circuit which are successively connected with the interface end of the CAN transceiver, and a protection circuit connected between the common-mode signal suppression circuit and the peak suppression circuit. With the use of the protection circuit, the intelligent protection circuit may effectively protect a transient diode in the peak suppression circuit when connected with external high voltage so as to effective protect the CAN transceiver. The intelligent protection circuit is simple in structure and comprehensively and reliably protects the CAN transceiver on the premise of not adding extra protecting devices.
Description
Technical field
The utility model relates to CAN transceiver application technical field, relates in particular to a kind of intelligent protection circuit of CAN transceiver.
Background technology
CAN transceiver is owing to directly receiving in the bus of outside, the signal more complicated in bus, and easily by wrong, thus damage CAN transceiver.General way is in the interface end of CAN transceiver, to add resistance and the transition diode in parallel of choke, series connection 1 Ω, and the shortcoming of the method is that 1 Ω resistance burns after external high pressure, can cause circuit malfunction.
Utility model content
The utility model is mainly to solve existing technical problem in prior art, thereby provides a kind of when external high pressure, and CAN transceiver is carried out to the effectively intelligent protection circuit of the CAN transceiver of protection.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals:
The intelligent protection circuit of CAN transceiver of the present utility model; comprise the terminating resistor, common-mode signal suppression circuit, the peak restrained circuit that are connected to described CAN transceiver interface end in turn, it also comprises the protective circuit being connected between described common-mode signal suppression circuit and peak restrained circuit.
Further, described protective circuit comprises first, second resettable fuse, and one end of described first, second resettable fuse is connected with described common-mode signal suppression circuit, and its other end is connected with peak restrained circuit, CAN transceiver respectively.
Further, described common-mode signal suppression circuit comprises common mode choke, the 4th pin of described common mode choke is connected with one end of described the first resettable fuse, the second resettable fuse with the 1st pin, its the 2nd pin is connected with one end, the holding wire CANL pin of described terminating resistor, and its 3rd pin is connected with the other end, the holding wire CANH pin of described terminating resistor.
Further, described peak restrained circuit comprises first, second transition diode, first, second electric capacity, described the first transition diode is connected with the other end, the CAN transceiver of described the first resettable fuse with first electric capacity rear one end parallel with one another, its other end ground connection, described the second transition diode is connected with the other end, the CAN transceiver of described the second resettable fuse afterwards with the second electric capacity is parallel with one another, its other end ground connection.
Further, described CAN transceiver comprises chip, the 1st pin of described chip, the 4th pin are connected with holding wire CANP pin, CANN pin respectively, its the 3rd, 5 pin is connected with+5V ,+3V power supply respectively, its the 2nd, 8 pin ground connection, its the 6th pin is connected with first transition diode one end, first electric capacity one end, the first resettable fuse other end, and its 7th pin is connected with second transition diode one end, second electric capacity one end, the second resettable fuse other end.
Further, the model of described chip is TLE6250, and the model of described first, second resettable fuse is MSM010.
Compared with prior art, the utility model has the advantage of: by increasing protective circuit, when external high pressure, can form effective protection to the transition diode in peak restrained circuit, and then CAN transceiver is effectively protected.This circuit structure is simple, additionally increases under the prerequisite of protection device not having, and CAN transceiver has been carried out comprehensively to protection reliably.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit diagram of the intelligent protection circuit of CAN transceiver of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail, thereby so that advantage of the present utility model and feature can be easier to be it will be appreciated by those skilled in the art that, protection range of the present utility model is made to more explicit defining.
Consult shown in Fig. 1; the intelligent protection circuit of CAN transceiver of the present utility model; comprise the terminating resistor R1, common-mode signal suppression circuit 1, the peak restrained circuit 3 that are connected to CAN transceiver 4 interface end in turn, it also comprises the protective circuit 2 being connected between common-mode signal suppression circuit 1 and peak restrained circuit 3.
Wherein, protective circuit 2 comprises first, second resettable fuse (F1, F2); one end of first, second resettable fuse (F1, F2) is connected with common-mode signal suppression circuit 1, and its other end is connected with peak restrained circuit 3, CAN transceiver 4 respectively.Common-mode signal suppression circuit 1 comprises common mode choke L1, and common mode choke L1 is used for suppressing common mode current.Concrete, the 4th pin of common mode choke L1 is connected with one end of the first resettable fuse F1, the second resettable fuse F2 with the 1st pin, the 2nd pin of common mode choke L1 is connected with one end of terminating resistor R1, holding wire CANL pin, and the 3rd pin of common mode choke L1 is connected with the other end of terminating resistor R1, holding wire CANH pin.
It comprises peak restrained circuit 3 for suppressing first, second transition diode (TVS1, TVS2) of instantaneous high pressure, first, second electric capacity (C1, C2), and wherein first, second electric capacity (C1, C2) is high-frequency filter capacitor.Concrete, the first transition diode TVS1 is connected with the other end, the CAN transceiver 4 of the first resettable fuse F1 with first capacitor C 1 rear one end parallel with one another, its other end ground connection, the second transition diode TVS2 is connected with the other end, the CAN transceiver phase 4 of described the second resettable fuse F2 afterwards with the second capacitor C 2 is parallel with one another, its other end ground connection.
In the utility model; the model of first, second resettable fuse (F1, F2) is MSM010; under normal condition; it has the D.C. resistance of 3 Ω left and right; in proper communication to signal without any harmful effect; but when bus end loads under long overpressure situation, can carry out good protection to circuit.Especially first, second transition diode (TVS1, TVS2) in peak restrained circuit 3 is protected, made its not long-time high pressure of reason and burning, thereby make circuit working more reliable.
Preferably, CAN transceiver 4 comprises chip U1, the model of chip U1 is TLE6250, the 1st pin of chip U1, the 4th pin respectively with holding wire CANP pin, CANN pin is connected, the 3rd pin of chip U1, the 5th pin respectively with+5V, + 3V power supply is connected, the 2nd pin of chip U1, the 8th pin ground connection, the 6th pin of chip U1 and first transition diode TVS1 one end, first capacitor C 1 one end, the first resettable fuse F1 other end is connected, the 7th pin of chip U1 and second transition diode TVS2 one end, second capacitor C 2 one end, the second resettable fuse F2 other end is connected.
The above, be only embodiment of the present utility model, but protection range of the present utility model is not limited to this, and any variation of expecting without creative work or replacement, within all should being encompassed in protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range that claims were limited.
Claims (6)
1. the intelligent protection circuit of a CAN transceiver; comprise the terminating resistor (R1), common-mode signal suppression circuit (1), the peak restrained circuit (3) that are connected to described CAN transceiver (4) interface end in turn, it is characterized in that: also comprise the protective circuit (2) being connected between described common-mode signal suppression circuit (1) and peak restrained circuit (3).
2. the intelligent protection circuit of CAN transceiver according to claim 1; it is characterized in that: described protective circuit (2) comprises first, second resettable fuse (F1, F2); one end of described first, second resettable fuse (F1, F2) is connected with described common-mode signal suppression circuit (1), and its other end is connected with peak restrained circuit (3), CAN transceiver (4) respectively.
3. the intelligent protection circuit of CAN transceiver according to claim 2; it is characterized in that: described common-mode signal suppression circuit (1) comprises common mode choke (L1); the 4th pin of described common mode choke (L1) is connected with one end of described the first resettable fuse (F1), the second resettable fuse (F2) respectively with the 1st pin; its the 2nd pin is connected with one end, the holding wire CANL pin of described terminating resistor (R1), and its 3rd pin is connected with the other end, the holding wire CANH pin of described terminating resistor (R1).
4. the intelligent protection circuit of CAN transceiver according to claim 3, it is characterized in that: described peak restrained circuit (3) comprises first, the second transition diode (TVS1, TVS2), first, the second electric capacity (C1, C2), the other end of described the first transition diode (TVS1) and the first electric capacity (C1) rear one end parallel with one another and described the first resettable fuse (F1), CAN transceiver (4) is connected, its other end ground connection, after described the second transition diode (TVS2) and the second electric capacity (C2) are parallel with one another with the other end of described the second resettable fuse (F2), CAN transceiver (4) is connected, its other end ground connection.
5. the intelligent protection circuit of CAN transceiver according to claim 4, it is characterized in that: described CAN transceiver (4) comprises chip (U1), the 1st pin of described chip (U1), the 4th pin respectively with holding wire CANP pin, CANN pin is connected, it is the 3rd years old, 5 pin respectively with+5V, + 3V power supply is connected, it is the 2nd years old, 8 pin ground connection, its the 6th pin and first transition diode (TVS1) one end, the first electric capacity (C1) one end, the first resettable fuse (F1) other end is connected, its the 7th pin and second transition diode (TVS2) one end, the second electric capacity (C2) one end, the second resettable fuse (F2) other end is connected.
6. the intelligent protection circuit of CAN transceiver according to claim 5, is characterized in that: the model of described chip (U1) is TLE6250, and the model of described first, second resettable fuse (F1, F2) is MSM010.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320656975.0U CN203553923U (en) | 2013-10-23 | 2013-10-23 | An intelligent protection circuit of a CAN transceiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320656975.0U CN203553923U (en) | 2013-10-23 | 2013-10-23 | An intelligent protection circuit of a CAN transceiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203553923U true CN203553923U (en) | 2014-04-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320656975.0U Expired - Fee Related CN203553923U (en) | 2013-10-23 | 2013-10-23 | An intelligent protection circuit of a CAN transceiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203553923U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104199365A (en) * | 2014-09-16 | 2014-12-10 | 衡阳泰豪通信车辆有限公司 | CAN (control area network) bus isolated communication protective circuit |
| CN106877942A (en) * | 2017-02-24 | 2017-06-20 | 深圳市沃特玛电池有限公司 | CAN electromagnetic interference suppression circuits |
-
2013
- 2013-10-23 CN CN201320656975.0U patent/CN203553923U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104199365A (en) * | 2014-09-16 | 2014-12-10 | 衡阳泰豪通信车辆有限公司 | CAN (control area network) bus isolated communication protective circuit |
| CN106877942A (en) * | 2017-02-24 | 2017-06-20 | 深圳市沃特玛电池有限公司 | CAN electromagnetic interference suppression circuits |
| EP3401152A1 (en) * | 2017-02-24 | 2018-11-14 | Optimum Battery Co., Ltd. | Electric vehicle and electromagnetic interference suppression circuit thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140416 Termination date: 20151023 |
|
| EXPY | Termination of patent right or utility model |