Converter communication method and apparatus

1. A communication method comprising:

detecting at a gate drive unit a change of state of a command signal that is received via a command link of the gate drive unit;

initiating, responsive to the change of state of the command signal, a blanking period in which the gate drive unit will process as incoming data at least one further change of state of the command signal; and

receiving incoming data at the gate drive unit, by processing modulations of the command signal, within the blanking period.

2. The communication method as claimed in claim 1 , further comprising transmitting outgoing data from the gate drive unit via the command link, within the blanking period, by modulation of a feedback signal.

3. The communication method as claimed in claim 2 , wherein the outgoing data is prepared by storing measured values in a memory.

4. The communication method as claimed in claim 2 , wherein the outgoing data includes data identifying the gate drive unit.

5. The communication method as claimed in claim 2 , wherein the incoming data includes a read address for selecting operational data to be included in the outgoing data.

6. The communication method as claimed in claim 1 , wherein the incoming data includes a write address for updating an operational parameter of the gate drive unit.

7. The communication method as claimed in claim 1 , wherein the incoming data includes an updated setpoint of gate drive voltage.

8. The communication method as claimed in claim 1 , wherein the incoming data includes an updated value for a duration of the blanking period.

9. The communication method as claimed in claim 1 , wherein the incoming data includes an expected value of data identifying the gate drive unit.

10. A power switch apparatus comprising:

a semiconductor power switch;

a gate drive unit connected to the semiconductor power switch;

a command link connecting the gate drive unit in communication with a controller;

wherein the gate drive unit is configured to receive a command signal from the controller via the command link, to detect a change of state of the command signal, to initiate, responsive to the change of state of the command signal, a blanking period in which the gate drive unit will process as incoming data at least one further change of state of the command signal, and to receive incoming data via the command link, within the blanking period.

11. The power switch apparatus as claimed in claim 10 , wherein the gate drive unit is further configured to transmit outgoing data to the controller via the command link, within the blanking period.

12. The power switch apparatus as claimed in claim 11 , wherein the outgoing data is transmitted via modulation of a feedback signal.

13. The power switch apparatus as claimed in claim 11 , further comprising a sensor apparatus configured to measure a value of at least one characteristic of the semiconductor power switch, the outgoing data including the measured value.

14. The power switch apparatus as claimed in claim 11 , wherein the outgoing data includes data identifying the gate drive unit.

15. The power switch apparatus as claimed in claim 11 , wherein the incoming data includes a read address for operational data to be included in the outgoing data.

16. The power switch apparatus as claimed in claim 10 , wherein the incoming data includes a write address for updating an operational parameter of the gate drive unit.

17. The power switch apparatus as claimed in claim 10 , wherein the incoming data includes an updated setpoint of gate drive voltage.

18. The power switch apparatus as claimed in claim 10 , wherein the incoming data includes an updated value for duration of the blanking period.

19. The power switch apparatus as claimed in claim 10 , wherein the incoming data includes an expected value of data identifying the gate drive unit.

20. A power converter comprising:

a plurality of semiconductor power switches;

a plurality of gate drive units connected to deliver gate voltages to the plurality of semiconductor power switches, each gate drive unit including a command link for connecting that gate drive unit in communication with a controller, and each gate drive unit configured to receive a command signal from the controller via the command link;

wherein at least one of the gate drive units is configured to detect a change of state of the command signal, to initiate a blanking period responsive to the change of state of the command signal, and, within the blanking period, to process as incoming data any further changes of state of the command signal.

21. The power converter as claimed in claim 20 , wherein the at least one of the gate drive units is configured to transmit outgoing data to the controller via the command link within the blanking period.

22. The power converter as claimed in claim 21 , wherein the outgoing data is transmitted via modulation of a feedback signal.

23. The power converter as claimed in claim 21 , wherein the outgoing data includes a measured value of at least one parameter of the semiconductor power switch to which the at least one of the gate drive units is connected.

24. The power converter as claimed in claim 21 , wherein the outgoing data includes data identifying the at least one of the gate drive units.

25. The power converter as claimed in claim 20 , wherein the incoming data includes a read address for operational data to be included in the outgoing data.

26. The power converter as claimed in claim 20 , wherein the incoming data includes a write address for updating an operational parameter of the at least one of the gate drive units.

27. The power converter as claimed in claim 20 , wherein the incoming data includes an updated setpoint of gate drive voltage.

28. The power converter as claimed in claim 20 , wherein the incoming data includes an updated value for duration of the blanking period.

29. The power converter as claimed in claim 20 , wherein the incoming data includes an expected value of data identifying the at least one of the gate drive units.