CN102059991A - CAN (controller area network) bus interface circuit for hybrid power automobile system - Google Patents
CAN (controller area network) bus interface circuit for hybrid power automobile system Download PDFInfo
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- CN102059991A CN102059991A CN 201010534203 CN201010534203A CN102059991A CN 102059991 A CN102059991 A CN 102059991A CN 201010534203 CN201010534203 CN 201010534203 CN 201010534203 A CN201010534203 A CN 201010534203A CN 102059991 A CN102059991 A CN 102059991A
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Abstract
The invention discloses a CAN (controller area network) bus interface circuit for a hybrid power automobile system, which has high interference rejection. The CAN bus interface circuit comprises a signal transmission end and a signal receiving end of a singlechip, a first CAN bus connector and a second CAN bus connector, wherein the signal transmission end and the signal receiving end of the singlechip are respectively connected with current limiting resistors, the current limiting resistors are respectively connected with photoelectric couplers, the photoelectric couplers are respectively connected on a CAN bus transceiver, the CAN bus transceiver is connected with a CAN bus common mode rejecter through a terminal impedance matching resistor, and the CAN bus common mode rejecter is connected with the first CAN bus connector and the second CAN bus connector through a transient voltage suppressor and a filtering capacitor.
Description
Technical field
The invention belongs to auto electric control system field, be specifically related to a kind of CAN bus interface circuit that is used for the hybrid vehicle system.
Background technology
Now increasing automotive use CAN bus communicates, the controller that use the automobile the inside is also more and more, and the power of the relevant device of automobile is also increasing, thereby cause the interference source of CAN bus signals also more and more, if automobile can not provide reasonable CAN bus signals quality, may cause between each controller of automobile can't proper communication, also may cause controller to produce misoperation; And if the interference ratio that the CAN bus is subjected to is bigger, the controller that also may cause being correlated with lost efficacy, and vehicle is in not slave mode.
Summary of the invention
For overcoming deficiency of the prior art, the object of the present invention is to provide a kind of CAN bus interface circuit that is used for the hybrid vehicle system that has than strong anti-interference ability.
In order to solve the problems of the technologies described above, realize above-mentioned purpose, the present invention has adopted following technical scheme:
A kind of CAN bus interface circuit that is used for the hybrid vehicle system, comprise the transmission signal end of micro controller system and received signal end and a CAN Bussing connector and the 2nd CAN Bussing connector of micro controller system, described micro controller system sends signal end and micro controller system received signal end is connected with first current-limiting resistance and second current-limiting resistance respectively, described first current-limiting resistance and second current-limiting resistance are connected with first photoelectrical coupler and second photoelectrical coupler respectively, described first photoelectrical coupler and second photoelectrical coupler are connected on the CAN bus transceiver, described CAN bus transceiver connects a CAN bus common mode inhibition device by a terminal impedance matched resistor, described CAN bus common mode inhibition device is connected a described CAN Bussing connector by first Transient Voltage Suppressor with first filter capacitor, described CAN bus common mode inhibition device is connected described the 2nd CAN Bussing connector by second Transient Voltage Suppressor with second filter capacitor.
The principle of work of the CAN bus interface circuit that is used for the hybrid vehicle system of the present invention is as follows:
When automotive control system needs the CAN bus transfer data, micro controller system sends signal end by described monolithic and the received signal end transmits and receive data, through directly entering first photoelectrical coupler and second electric coupler behind first current-limiting resistance and second current-limiting resistance, because first photoelectrical coupler and second electric coupler are by photoelectricity transmission, has very strong disturbance rejection effect, so the transmission signal of micro controller system and received signal have reasonable signal quality after by first photoelectrical coupler and second electric coupler, that is to say that first photoelectrical coupler and second electric coupler have played buffer action in the transmission course of whole signal, can prevent that the noise that some noises enter on micro controller system or the circuit card on the CAN bus from outwards sending by the CAN bus.
It is the CAN bus differential signal that transmission signal and received signal with micro controller system are converted to standard that the CAN bus transceiver mainly acts on, and play conversion level effect, increased the terminal impedance matched resistor between the CAN bus differential signal that the CAN bus transceiver comes out, it mainly has been CAN bus transfer impedance match effect, enter CAN bus common-mode noise suppressing unit afterwards again, CAN bus common-mode noise suppressing unit mainly is the common-mode noise that is used for suppressing on the CAN bus signals, prevent that the common-mode noise on the CAN bus from entering vehicle-mounted relevant controller, the controller of avoiding the existence owing to common-mode noise to cause being correlated with can't be discerned the CAN bus signals even cause the CAN bus to communicate.
Because the intermittent work of high power device in the complexity of automobile work and the automobile; may cause producing on the CAN bus bigger transient energy noise; described first Transient Voltage Suppressor and first Transient Voltage Suppressor are used for the transient energy noise on the filtering CAN bus; prevent that the transient energy noise from entering CAN bus transceiver or related device; and then damage CAN bus transceiver or related device; first Transient Voltage Suppressor and first Transient Voltage Suppressor are to shield; normal CAN bus signals is unaffected; the transient energy noise that surpasses CAN bus signals level is through the ground wire of being released after first Transient Voltage Suppressor and first Transient Voltage Suppressor, also just makes transient energy noise on the CAN bus signal line by filtering.
Described first filter capacitor and first filter capacitor mainly are to be used for low-frequency noise signal on the filtering CAN bus signal line, provide Vehicle Controller cleaner CAN bus signals.
Compared with prior art, the present invention has than strong anti-interference ability, and implement fairly simple, only need on the circuit card of controller, increase several electronic devices and components and do corresponding connection and get final product, the actual expense that increases is not high, but realized CAN bus signals quality preferably, greatly reduced owing to CAN signal quality problem causes the not controlled possibility of vehicle.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification sheets, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is the schematic block circuit diagram that is used for the CAN bus interface circuit of hybrid vehicle system of the present invention.
Fig. 2 is the schematic circuit diagram that are used for CAN bus interface circuit one specific embodiment of hybrid vehicle system of the present invention.
Number in the figure explanation: 1, first current-limiting resistance, 2, second current-limiting resistance, 3, first photoelectrical coupler, 4, second photoelectrical coupler, 5, CAN bus transceiver, 6, the terminal impedance matched resistor, 7, CAN bus common mode inhibition device, 8, first Transient Voltage Suppressor, 9, second Transient Voltage Suppressor, 10, first filter capacitor, 11, second filter capacitor, 12, a CAN Bussing connector, the 13, the 2nd CAN Bussing connector.
The specific embodiment
Below in conjunction with drawings and Examples technology implementation process of the present invention is described further.
Referring to illustrated in figures 1 and 2, a kind of CAN bus interface circuit that is used for the hybrid vehicle system, comprise the transmission signal end of micro controller system and received signal end and a CAN Bussing connector 12 and the 2nd CAN Bussing connector 13 of micro controller system, described micro controller system sends signal end and micro controller system received signal end is connected with first current-limiting resistance 1 and second current-limiting resistance 2 respectively, described first current-limiting resistance 1 and second current-limiting resistance 2 are connected with first photoelectrical coupler 3 and second photoelectrical coupler 4 respectively, described first photoelectrical coupler 3 and second photoelectrical coupler 4 are connected on the CAN bus transceiver 5, described CAN bus transceiver 5 connects a CAN bus common mode inhibition device 7 by a terminal impedance matched resistor 6, described CAN bus common mode inhibition device 7 is connected a described CAN Bussing connector 12 by first Transient Voltage Suppressor 8 with first filter capacitor 10, described CAN bus common mode inhibition device 7 is connected described the 2nd CAN Bussing connector 13 by second Transient Voltage Suppressor 9 with second filter capacitor 11.
The foregoing description just is to allow the one of ordinary skilled in the art can understand content of the present invention and enforcement according to this for technical conceive of the present invention and characteristics being described, its objective is, can not limit protection scope of the present invention with this.The variation or the modification of every equivalence that the essence of content has been done according to the present invention all should be encompassed in protection scope of the present invention.
Claims (1)
1. CAN bus interface circuit that is used for the hybrid vehicle system, the transmission signal end and received signal end and a CAN Bussing connector (12) and the 2nd CAN Bussing connector (13) that comprise micro controller system, it is characterized in that: the transmission signal end of described micro controller system and received signal end are connected with first current-limiting resistance (1) and second current-limiting resistance (2) respectively, described first current-limiting resistance (1) and second current-limiting resistance (2) are connected with first photoelectrical coupler (3) and second photoelectrical coupler (4) respectively, described first photoelectrical coupler (3) and second photoelectrical coupler (4) are connected on the CAN bus transceiver (5), described CAN bus transceiver (5) connects a CAN bus common mode inhibition device (7) by a terminal impedance matched resistor (6), described CAN bus common mode inhibition device (7) is connected a described CAN Bussing connector (12) by first Transient Voltage Suppressor (8) with first filter capacitor (10), described CAN bus common mode inhibition device (7) is connected described the 2nd CAN Bussing connector (13) by second Transient Voltage Suppressor (9) with second filter capacitor (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010534203 CN102059991A (en) | 2010-11-08 | 2010-11-08 | CAN (controller area network) bus interface circuit for hybrid power automobile system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010534203 CN102059991A (en) | 2010-11-08 | 2010-11-08 | CAN (controller area network) bus interface circuit for hybrid power automobile system |
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| CN102059991A true CN102059991A (en) | 2011-05-18 |
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| CN 201010534203 Pending CN102059991A (en) | 2010-11-08 | 2010-11-08 | CAN (controller area network) bus interface circuit for hybrid power automobile system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381263A (en) * | 2011-09-20 | 2012-03-21 | 北京宇航系统工程研究所 | Power distribution controller based on CAN (controller area network) bus |
| CN102490669A (en) * | 2011-12-09 | 2012-06-13 | 綦江齿轮传动有限公司 | Automobile CAN (Controller Area Network) bus adapter circuit and method thereof |
| CN104135142A (en) * | 2014-07-29 | 2014-11-05 | 中国东方电气集团有限公司 | Filter circuit of an asynchronous motor drive controller of an electric vehicle and method thereof |
| CN105827689A (en) * | 2015-01-22 | 2016-08-03 | 英飞凌科技股份有限公司 | Pulse width modulated (PWM) sensor interface using terminated symmetrical physical layer |
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| CN2638142Y (en) * | 2003-08-29 | 2004-09-01 | 清华大学 | Portable CAN bus analysis recorder based on USB interface |
| CN2638141Y (en) * | 2003-08-29 | 2004-09-01 | 清华大学 | Portable CAN bus analysis recorder based on CF card |
| CN201467155U (en) * | 2009-04-15 | 2010-05-12 | 同济大学 | CAN bus transceiver interface circuit |
| CN201863784U (en) * | 2010-11-08 | 2011-06-15 | 苏州海格新能源汽车电控系统科技有限公司 | CAN (controller area network) bus interface circuit for hybrid vehicle system |
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2010
- 2010-11-08 CN CN 201010534203 patent/CN102059991A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2638142Y (en) * | 2003-08-29 | 2004-09-01 | 清华大学 | Portable CAN bus analysis recorder based on USB interface |
| CN2638141Y (en) * | 2003-08-29 | 2004-09-01 | 清华大学 | Portable CAN bus analysis recorder based on CF card |
| CN201467155U (en) * | 2009-04-15 | 2010-05-12 | 同济大学 | CAN bus transceiver interface circuit |
| CN201863784U (en) * | 2010-11-08 | 2011-06-15 | 苏州海格新能源汽车电控系统科技有限公司 | CAN (controller area network) bus interface circuit for hybrid vehicle system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381263A (en) * | 2011-09-20 | 2012-03-21 | 北京宇航系统工程研究所 | Power distribution controller based on CAN (controller area network) bus |
| CN102381263B (en) * | 2011-09-20 | 2014-07-02 | 北京宇航系统工程研究所 | Power distribution controller based on CAN (controller area network) bus |
| CN102490669A (en) * | 2011-12-09 | 2012-06-13 | 綦江齿轮传动有限公司 | Automobile CAN (Controller Area Network) bus adapter circuit and method thereof |
| CN104135142A (en) * | 2014-07-29 | 2014-11-05 | 中国东方电气集团有限公司 | Filter circuit of an asynchronous motor drive controller of an electric vehicle and method thereof |
| CN105827689A (en) * | 2015-01-22 | 2016-08-03 | 英飞凌科技股份有限公司 | Pulse width modulated (PWM) sensor interface using terminated symmetrical physical layer |
| CN105827689B (en) * | 2015-01-22 | 2019-12-20 | 英飞凌科技股份有限公司 | Pulse Width Modulation (PWM) sensor interface using capped symmetric physical layer |
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Application publication date: 20110518 |