Systems and methods for single channel fault encoding for inverter for electric vehicle

1. A system comprising:

an inverter configured to convert DC power from a battery to AC power to drive a motor, wherein the inverter includes:

a point-of-use controller configured to:

detect a fault;

determine a fault type of the detected fault from among n fault types;

determine a fault response group to which the determined fault type belongs from among m fault response groups;

encode the determined fault response group; and

transmit the encoded fault response group via a communication interface; and

a phase controller configured to:

receive the encoded fault response group from the point-of-use controller via the communication interface;

determine the fault response group;

decode the determined fault response group; and

output the decoded fault response group.

2. The system of claim 1 , wherein

m<n

each of the m fault response groups is unique, and

a number of the m fault response groups is exactly equal to a number of unique fault responses.

3. The system of claim 1 , wherein the communication interface is a single channel bi-directional interface.

4. The system of claim 1 , wherein the point-of-use controller is a remote mounted gate driver integrated circuit in a high voltage area of the inverter separated from a low voltage area of the inverter by a galvanic isolator, and the phase controller is a control integrated circuit in the high voltage area of the inverter.

5. The system of claim 1 , wherein

the point-of-use controller is further configured to store the fault type,

the phase controller is further configured to transmit, to the point-of-use controller, a request for the stored fault type, and

the point-of-use controller is further configured to receive the request from the phase controller for the stored fault type, and transmit the stored fault type to the phase controller based on the request.

6. The system of claim 1 ,

wherein the point-of-use controller is further configured to store first mapping information that maps each of the n fault types to a respective fault response group from among the m fault response groups; and

wherein the phase controller is further configured to store second mapping information that maps each of the m fault response groups to the decoded fault response group.

7. The system of claim 1 , further comprising:

the battery configured to supply the DC power to the inverter; and

the motor configured to receive the AC power from the inverter to drive the motor.

8. A method comprising:

detecting, by a point-of-use controller for an inverter for an electric vehicle, a fault;

determining, by the point-of-use controller, a fault type of the detected fault from among n fault types;

determining, by the point-of-use controller, a fault response group to which the determined fault type belongs from among m fault response groups;

encoding, by the point-of-use controller, the determined fault response group; and

transmitting, by the point-of-use controller, the encoded fault response group via a communication interface to a phase controller for the inverter for the electric vehicle.

9. The method of claim 8 , wherein m<n.

10. The method of claim 8 , wherein the communication interface is a single channel bi-directional interface.

11. The method of claim 8 , wherein the point-of-use controller is a remote mounted gate driver integrated circuit, and the phase controller is a control integrated circuit.

12. The method of claim 8 , further comprising:

storing, by the point-of-use controller, the fault type.

13. The method of claim 12 , further comprising:

receiving, by the point-of-use controller, a request from the phase controller for the stored fault type; and

transmitting, by the point-of-use controller, the stored fault type to the phase controller based on the request.

14. The method of claim 8 , further comprising:

storing, by the point-of-use controller, mapping information that maps each of the n fault types to a respective fault response group from among the m fault response groups,

wherein the determining, by the point-of-use controller, the fault response group comprises determining the fault response group based on the stored mapping information.

15. A method for communication between a point-of-use controller for an inverter for an electric vehicle and a phase controller for the inverter for the electric vehicle, the method comprising:

receiving, by the phase controller, an encoded fault response group from the point-of-use controller via a communication interface;

determining, by the phase controller, the fault response group from among m fault response groups;

decoding, by the phase controller, the determined fault response group; and

outputting, by the phase controller, the decoded fault response group.

16. The method of claim 15 , further comprising:

transmitting, by the phase controller, a request for a stored fault type, from among n fault types, to the point-of-use controller; and

receiving, by the phase controller, the stored fault type from the point-of-use controller.

17. The method of claim 16 , wherein m<n.

18. The method of claim 15 , further comprising:

storing, by the phase controller, mapping information that maps each of the m fault response groups to the decoded fault response group;

wherein the decoding, by the phase controller, the determined fault response group comprises determining the fault response group based on the stored mapping information.

19. The method of claim 18 , wherein the decoded fault response group corresponds to states for fault pins of a multi-wire communication bus.

20. The method of claim 15 , further comprising:

receiving, by the phase controller, a fault response, based on the outputting the decoded fault response group; and

sending, by the phase controller, the fault response to the point-of-use controller.