CN102880483A - Serial port programming and watchdog compatible circuit of electric driving controller of electric vehicle - Google Patents
Serial port programming and watchdog compatible circuit of electric driving controller of electric vehicle Download PDFInfo
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- CN102880483A CN102880483A CN201210288661XA CN201210288661A CN102880483A CN 102880483 A CN102880483 A CN 102880483A CN 201210288661X A CN201210288661X A CN 201210288661XA CN 201210288661 A CN201210288661 A CN 201210288661A CN 102880483 A CN102880483 A CN 102880483A
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- enable signal
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Abstract
The invention discloses a serial port programming and watchdog compatible circuit of an electric driving controller of an electric vehicle. The serial port programming and watchdog compatible circuit is characterized by comprising an external serial port programming enable signal end, a signal conversion circuit and a watchdog shielding circuit, wherein when a serial port is required to be used for programming, the external serial port programming enable signal end is directly connected to a serial port programming 12V ground enable signal; the signal conversion circuit converts the serial port programming 12V ground enable signal into a 3.3V ground enable signal and an enable signal which can be received by a serial port programming enable pin in a digital signal processor (DSP) master control chip to identify a programming instruction; the 3.3V ground enable signal serves as a watchdog shielding signal, and a programming function is normally realized by shielding a watchdog function; and when an external serial port programming enable signal disappears, a design function of a watchdog is recovered. By adoption of the serial port programming and watchdog compatible circuit of the electric driving controller of the electric vehicle, a hardware DSP serial port programming circuit is compatible with a watchdog compatible circuit in a hardware circuit of a pure electric vehicle motor controller.
Description
Technical field
The present invention relates to a kind of serial ports programming and house dog compatible circuit that is applied in the electric automobile electricity driving governor.
Background technology
In numerous DSP control circuits, need to carry out program burn writing to dsp chip, in order to reach the control purpose, normally carry out programming by JTAG and serial ports dual mode; And in some important product; as in the electric machine controller of electric automobile; need to add necessary watchdog circuit; monitor at any time the whether normally operation of DSP program; when program fleet or other faults occurring; use watchdog circuit that DSP is resetted, remove rapidly fault, with the security of protection vehicle.In electric automobile, the performance of car load and the safety of human pilot of directly having influence on whether working properly of controller, therefore, the adding watchdog circuit is most important in controller.In the prior art, do not have program that watchdog circuit is carried out " feeding dog " operation after the PCB circuit board machines, therefore it resets to DSP always, can't carry out the programming program this moment to DSP.
Summary of the invention
The present invention is for avoiding the existing weak point of above-mentioned prior art, a kind of electric automobile electricity driving governor serial ports programming and house dog compatible circuit are provided, so that in the hardware circuit of controller for motor of pure electric vehicle, hardware DSP serial ports programming circuit can coexist with watchdog circuit, after serial ports programming program is complete, house dog can recover again normal operation, avoid in some control circuit, because the existence of watchdog circuit can't be carried out program burn writing to its main control chip by serial ports.
The present invention is that the technical solution problem adopts following technical scheme:
Electric automobile electricity driving governor serial ports programming of the present invention and house dog compatible circuit include:
One outside serial ports programming enable signal end when needs use serial ports to carry out programming, directly accesses the ground enable signal of serial ports programming 12V at described outside serial ports programming enable signal end;
One signaling conversion circuit is that ground enable signal with described serial ports programming 12V converts the enable signal that serial ports programming enable pin can receive in the ground enable signal of 3.3V and the DSP main control chip to, with identification programming instruction;
One house dog screened circuit is that ground enable signal with described 3.3V is as the house dog shielded signal, by the shielding watchdog function, so that the programming function is normally finished; And when externally serial ports programming enable signal disappears, recover the design function of house dog.
Described signaling conversion circuit is set to, the signal conversion buffer circuit that the ground enable signal WR of outside serial ports programming enable signal end 12V forms by current-limiting resistance R1, filter capacitor C1 and optical coupling isolator U1 converts the ground enable signal BOOT_EN of 3.3V to, is linked into the control pin of house dog screened circuit with the ground enable signal BOOT_EN of described 3.3V; Access resistance R 5 and the R6 of setting that connect between the end pin of described 3.3V supply voltage and ground enable signal BOOT_EN, with the resistance of resistance R 5 resistances much larger than resistance R 6, between resistance R 5 and R6, obtain to be similar to the leg signal BOOT_ENXF of ground enable signal BOOT_EN, and described leg signal BOOT_ENXF is accessed the serial ports programming enable pin of main control chip DSP.
Described house dog screened circuit is comprised of triode Q1, watchdog chip U2 and corresponding pull-up resistor R2, R3, R4 and filter capacitor C2, C3; The ground enable signal BOOT_EN of described signaling conversion circuit 3.3V connects the base stage of triode Q1, with the base stage of the described triode Q1 control pin as the house dog screened circuit, spill over end 8 pin of watchdog chip U2
Connect the emitter of triode Q1, reset signal input end 1 pin
Connect the collector of triode.
Compared with the prior art, beneficial effect of the present invention is embodied in:
The present invention has realized house dog and serial ports programming coexistence, and it realizes simple, and required device is few, and function-stable is normal.
Description of drawings
Fig. 1 is system chart of the present invention;
Fig. 2 is signaling conversion circuit circuit theory diagrams among the present invention;
Fig. 3 is house dog screened circuit schematic diagram among the present invention.
Embodiment
Referring to Fig. 1, electric automobile electricity driving governor serial ports programming and house dog compatible circuit include in the present embodiment:
One outside serial ports programming enable signal end, when needs used serial ports to carry out programming, externally serial ports programming enable signal end directly accessed the ground enable signal of serial ports programming 12V;
One signaling conversion circuit is that ground enable signal with serial ports programming 12V converts the enable signal that serial ports programming enable pin can receive in the ground enable signal of 3.3V and the DSP main control chip to, with identification programming instruction;
One house dog screened circuit is that ground enable signal with 3.3V is as the house dog shielded signal, by the shielding watchdog function, so that the programming function is normally finished; And when externally serial ports programming enable signal disappears, recover the design function of house dog.
In the implementation, as shown in Figure 2:
Signaling conversion circuit is set to, the signal conversion buffer circuit that the ground enable signal WR of outside serial ports programming enable signal end 12V forms by current-limiting resistance R1, filter capacitor C1 and optical coupling isolator U1 converts the ground enable signal BOOT_EN of 3.3V to, is linked into the control pin of house dog screened circuit with the ground enable signal BOOT_EN of 3.3V; Access resistance R 5 and the R6 of setting that connect between the end pin of 3.3V supply voltage and ground enable signal BOOT_EN, with the resistance of resistance R 5 resistances much larger than resistance R 6, between resistance R 5 and R6, obtain to be similar to the leg signal BOOT_ENXF of ground enable signal BOOT_EN, and leg signal BOOT_ENXF is accessed the serial ports programming enable pin of main control chip DSP.
Referring to Fig. 3, the house dog screened circuit is comprised of triode Q1, watchdog chip U2 and corresponding pull-up resistor R2, R3, R4 and filter capacitor C2, C3; The ground enable signal BOOT_EN of signaling conversion circuit 3.3V connects the base input end of triode Q1, with the base stage of the triode Q1 control pin as the house dog screened circuit, spill over end 8 pin of watchdog chip U2
Connect the emitter of triode Q1, reset signal input end 1 pin
Connect the collector of triode.Be linked into the base stage of the triode Q1 of watchdog circuit when enable signal, triode Q1 is turn-offed, so just shielded the normal serviceability of house dog, thus can be the correctly complete programming of assurance program.
Fig. 2 illustrates, the outside serial ports programming of WR enable signal, it is the earth signal of 12V, by the signal conversion buffer circuit that current-limiting resistance R1, R5, R6, filter capacitor C1 and optical coupling isolator U1 form, converts the ground enable signal BOOT_EN of 3.3V to through light-coupled isolation; When not carrying out serial ports programming program, WR is the 12V high level, not conducting of optical coupling isolator U1, so the control signal BOOT_EN of house dog output control circuit is the 3.3V high level, triode Q1 is in conducting state like this, spill over 8 pin of watchdog chip
With reset signal input end 1 pin
Be communicated with, at this moment, if the WDI pin of house dog does not carry out it " hello dog " operation, 8 pin
Will overflow, feed back to 1 pin by triode Q1
End, and then at 7 pin of watchdog chip
Will export reset signal, this reset signal is directly received on the reset pin of main control chip DSP, thereby DSP is resetted, and realizes defencive function; When outside serial ports programming request was arranged, WR was the earth signal of 12V, optical coupling isolator U1 conducting this moment, and BOOT_ENXF, BOOT_EN are low level, like this, triode Q1 closes, when at this moment, not carrying out " feeding dog " operation at the WDI of watchdog chip pin, 8 pin
The signal that overflows can not feed back to 1 pin
End, therefore, at 7 pin
End can not exported reset signal, so DSP can work this moment, normally programming of program, after programming finishes, the outside enable signal of WR disappears, and not conducting of optical coupling isolator U1 is so BOOT_EN is the 3.3V high level, triode Q1 conducting, and then the watchdog circuit serviceability of bringing into normal play.
Claims (3)
1. the driving governor serial ports programming of electric automobile electricity and house dog compatible circuit is characterized in that including:
One outside serial ports programming enable signal end when needs use serial ports to carry out programming, directly accesses the ground enable signal of serial ports programming 12V at described outside serial ports programming enable signal end;
One signaling conversion circuit is that ground enable signal with described serial ports programming 12V converts the enable signal that serial ports programming enable pin can receive in the ground enable signal of 3.3V and the DSP main control chip to, with identification programming instruction;
One house dog screened circuit is that ground enable signal with described 3.3V is as the house dog shielded signal, by the shielding watchdog function, so that the programming function is normally finished; And when externally serial ports programming enable signal disappears, recover the design function of house dog.
2. electric automobile according to claim 1 electricity driving governor serial ports programming and house dog compatible circuit is characterized in that:
Described signaling conversion circuit is set to, the signal conversion buffer circuit that the ground enable signal WR of outside serial ports programming enable signal end 12V forms by current-limiting resistance R1, filter capacitor C1 and optical coupling isolator U1 converts the ground enable signal BOOT_EN of 3.3V to, is linked into the control pin of house dog screened circuit with the ground enable signal BOOT_EN of described 3.3V; Access resistance R 5 and the R6 of setting that connect between the end pin of described 3.3V supply voltage and ground enable signal BOOT_EN, with the resistance of resistance R 5 resistances much larger than resistance R 6, between resistance R 5 and R6, obtain to be similar to the leg signal BOOT_ENXF of ground enable signal BOOT_EN, and described leg signal BOOT_ENXF is accessed the serial ports programming enable pin of main control chip DSP.
3. electric automobile according to claim 2 electricity driving governor serial ports programming and house dog compatible circuit is characterized in that:
Described house dog screened circuit is comprised of triode Q1, watchdog chip U2 and corresponding pull-up resistor R2, R3, R4 and filter capacitor C2, C3; The ground enable signal BOOT_EN of described signaling conversion circuit 3.3V connects the base stage of triode Q1, with the base stage of the described triode Q1 control pin as the house dog screened circuit, spill over end 8 pin of watchdog chip U2
Connect the emitter of triode Q1, reset signal input end 1 pin
Connect the collector of triode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210288661.XA CN102880483B (en) | 2012-08-14 | 2012-08-14 | Serial port programming and watchdog compatible circuit of electric driving controller of electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210288661.XA CN102880483B (en) | 2012-08-14 | 2012-08-14 | Serial port programming and watchdog compatible circuit of electric driving controller of electric vehicle |
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| CN102880483B CN102880483B (en) | 2015-07-01 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103676728A (en) * | 2013-11-27 | 2014-03-26 | 奇瑞汽车股份有限公司 | Watchdog circuit system for electronic control unit of automobile |
| CN104063252A (en) * | 2014-07-02 | 2014-09-24 | 中国科学院长春光学精密机械与物理研究所 | Program burning and backward-reading method with watchdog circuit and based on DSP chip |
| CN105700915A (en) * | 2015-12-31 | 2016-06-22 | 北京经纬恒润科技有限公司 | Method and device integrating watchdog function and monitoring software programming function |
| CN109522247A (en) * | 2019-01-04 | 2019-03-26 | 南京亚派科技股份有限公司 | It is a kind of to there is line writing and double without line writing to select switching circuit based on serial ports |
| CN112433589A (en) * | 2020-10-30 | 2021-03-02 | 天津航空机电有限公司 | Double-margin DSP anti-reset locking circuit |
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| CN101488102A (en) * | 2009-03-03 | 2009-07-22 | 福建师范大学 | Control circuit of watchdog in embedded system |
| CN201828797U (en) * | 2010-06-24 | 2011-05-11 | 王玉梅 | Circuit for preventing resetting of central processing unit (CPU) in programming process of digital signal processor (DSP) chip |
| CN102081558A (en) * | 2011-01-24 | 2011-06-01 | 北京北大千方科技有限公司 | Watchdog circuit in on-board unit and on-board unit |
| CN102214124A (en) * | 2011-06-08 | 2011-10-12 | 深圳市理邦精密仪器股份有限公司 | Watchdog reset control system |
| CN202815812U (en) * | 2012-08-14 | 2013-03-20 | 安徽巨一自动化装备有限公司 | Compatible circuits of serial port serial port programming and watchdog for electric automobile electric drive controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101488102A (en) * | 2009-03-03 | 2009-07-22 | 福建师范大学 | Control circuit of watchdog in embedded system |
| CN201828797U (en) * | 2010-06-24 | 2011-05-11 | 王玉梅 | Circuit for preventing resetting of central processing unit (CPU) in programming process of digital signal processor (DSP) chip |
| CN102081558A (en) * | 2011-01-24 | 2011-06-01 | 北京北大千方科技有限公司 | Watchdog circuit in on-board unit and on-board unit |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103676728A (en) * | 2013-11-27 | 2014-03-26 | 奇瑞汽车股份有限公司 | Watchdog circuit system for electronic control unit of automobile |
| CN103676728B (en) * | 2013-11-27 | 2016-09-07 | 奇瑞新能源汽车技术有限公司 | Watchdog circuit system for electronic control unit of automobile |
| CN104063252A (en) * | 2014-07-02 | 2014-09-24 | 中国科学院长春光学精密机械与物理研究所 | Program burning and backward-reading method with watchdog circuit and based on DSP chip |
| CN104063252B (en) * | 2014-07-02 | 2017-07-14 | 中国科学院长春光学精密机械与物理研究所 | Program burn writing with watchdog circuit and read-back approach based on dsp chip |
| CN105700915A (en) * | 2015-12-31 | 2016-06-22 | 北京经纬恒润科技有限公司 | Method and device integrating watchdog function and monitoring software programming function |
| CN105700915B (en) * | 2015-12-31 | 2019-02-19 | 北京经纬恒润科技有限公司 | A kind of method and apparatus for taking into account watchdog function and monitoring of software programming function |
| CN109522247A (en) * | 2019-01-04 | 2019-03-26 | 南京亚派科技股份有限公司 | It is a kind of to there is line writing and double without line writing to select switching circuit based on serial ports |
| CN112433589A (en) * | 2020-10-30 | 2021-03-02 | 天津航空机电有限公司 | Double-margin DSP anti-reset locking circuit |
| CN112433589B (en) * | 2020-10-30 | 2022-11-01 | 天津航空机电有限公司 | Double-margin DSP anti-reset locking circuit |
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| CN102880483B (en) | 2015-07-01 |
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Inventor after: Liu Lei Inventor after: Sun Chunzhe Inventor after: Gui Xingxing Inventor after: Xu Yi Inventor after: Chi Shihong Inventor after: Zhao Qianjian Inventor before: Lin Juguang Inventor before: Wang Shuwang Inventor before: Liu Lei Inventor before: Sun Chunzhe Inventor before: Gui Xingxing Inventor before: Xu Yi Inventor before: Chi Shihong Inventor before: Zhao Qianjian |
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Effective date of registration: 20160829 Address after: Baohe Industrial District of Hefei City, Anhui province 230051 Shanghai Road East Dalian Road Patentee after: HEFEI JUYI POWER SYSTEM CO., LTD. Address before: 230051 Anhui Province, Hefei City Industrial Park, Baohe Jianghuai heavy industry base Patentee before: Anhui Jee Automation Equipment Co., Ltd. |