Serial port programming and watchdog compatible circuit of electric driving controller of electric vehicle

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 [0001] The invention relates to a serial programming and watchdog compatible circuit applied in an electric drive controller of an electric vehicle. Background technique [0002] In many DSP control circuits, it is necessary to program the DSP chip in order to achieve the purpose of control, usually through JTAG and serial ports; and in some important products, such as the motor controller of electric vehicles In the process, it is necessary to add the necessary watchdog circuit to monitor whether the DSP program is running normally at any time. When the program runs away or other faults occur, the watchdog circuit is used to reset the DSP and clear the fault quickly to protect the safety of the vehicle. In electric vehicles, the normal operation of the controller directly affects the performance of the vehicle and the safety of the driver. Therefore, it is very important to add a watchdog circuit to the controller. In the prior art, there is no program to "...

AI Technical Summary

Problems solved by technology

In the prior art, there is no program to "feed the dog" to the watchdog circuit after the PCB circuit board is processed, so it always resets the DSP, and it is impossible to program the DSP at this time

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