6.5 Typical Technology
219
Solar ele. Requirement
satisfied and in telecomm.
coverage?
No
Telecomm. Mode change by
ground command .
Yes
Thermal control Mode changed
by ground command,ready for
lunar night.
Solar array attitude changed by
ground command to ensure
power requirement satisfied
when awakened.
Shut off switch of SMU main
bus, discharge switch of battery
packs in sequence by ground
command.
Shut off secondary power
switch of power controller,
connect awakening load with
main bus by ground command.
When main bus voltage was
lower than specific threshold ,
close awakening enable switch
in power controller by ground
command.
Shut off power of all
instruments to hibernate.
(a)
Power output >
minimum load
When lunar daytime
came, power output of
solar array increased
gradually
No
Powered on secondary
power module of power
controller, disconnected
awakening load.
Discharge switch of
battery packs closed by
awakening control circuit,
main bus of power
controller closed.
Powered on telecomm.
Instruments by power
controller to recover
up/down link
Set up operation mode by
ground command.
Completion of awakening,
to operation mode in lunar
daytime
Yes
(b)
Thermal control Mode
changed by ground
command, ready for lunar
daytime.
Fig. 6.5 Workflow diagram of hibernation and awakening (a) Hibernation process; (b) Awakening
process