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dc_power_supply intf: Improve description #883

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Oct 2, 2024
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dc_power_supply intf: Improve description #883

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10 changes: 9 additions & 1 deletion interfaces/power_supply_DC.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,15 @@ description: >-
(e.g. communication to the hardware is lost), the driver module shall cache the last mode and voltage/current settings.
Once the PSU is back on-line (e.g. after a CommunicationFault), set the last mode and voltage/current value received and only after that clear the error.

3) var voltage_current shall be published on regular intervals. The interval depends on the hardware, but it shall be at least once per second. If possible,
3) setMode to Off requires special attention. To avoid switching the output relays of the charger off under full load, make sure to return
from the setMode function(Off) only when the current is below a safe threshold for switching off the relays (exact value is hardware dependent).
If communication is lost with the power supply, make sure to still return, the call must not block for a longer period of time.
EVerest will ensure the order of the calls is correct during shutdown, but will not wait for the power supply to actually turn off:
1. call setMode(Off) on power_supply_DC
2. call allow_power_on(false) on evse_board_support
If the setMode(Off) returns immediately, it may happen that the bsp implementation opens the relays before the power supply is shutdown.

4) var voltage_current shall be published on regular intervals. The interval depends on the hardware, but it shall be at least once per second. If possible,
update at e.g. 4 Hertz is recommended.
cmds:
setMode:
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