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6 Power Technology of Lunar Lander
6.5.4 Design of Hibernation and Awakening Control
1. Technical Difficulties
Technical difficulties of hibernation and awakening control included two main
aspects. When the lunar night came, all equipment must be shut down completely. The
normal sequence for power-off implementation of the power controller of main bus
and the OBDH computer for command driving power were coupled. Therefore, the
power-off sequence for power controller and OBDH computer was cross coupled. So,
it was a technical difficulty to shut off the last instrument. When the lunar daytime
came, the lunar lander should be transferred from hibernation to awakening. The
awakening of the first equipment should work autonomously by the external input
conditions, and then other instruments were powered on according to predetermined
procedure to recover telecommand and telemetry of the lunar lander.
2. Implementation Method
After the telecommunication coverage, temperature adaptability, angle range of
solar array and power balance were considered for the lunar lander, hibernation
and autonomous awakening method were designed for solution. The instruments
of the lunar lander would be shut down subsequently by ground commands before
lunar night to hibernate. The awakening process was triggered by sunlight when the
solar array power output met the requirement for minimum operation mode load.
The awakening control circuit would send instruction autonomously to power on
battery packs, OBDH computer and power supply controller, and then power on other
instrument to implement transfer to the normal operation mode in lunar daytime.
3. Key Control Switch
The hibernation and awakening control circuit consisted of many key switches for
control of the power supply. The center of hibernation and awakening method was
to design the power on/off sequence of the key control switches.
4. Process of Hibernation and Awakening
The workflow diagram of hibernation and awakening is shown in Fig. 6.5.
6.5.5 Power Supply Reuse Between Probes
Due to strict mass constraint, additional mass would be necessary for the lunar lander
and the lunar rover if they used their own power system to provide energy.
For the Chang’ E-3 lunar lander, no additional mass was required by making full
use of original power supply controller modules of the lunar lander and the lunar rover.
The energy share circuit and logic control command and was designed to implement
energy share between the lunar lander and the lunar rover. The interface of energy
share is shown in Fig. 6.6. After the lunar lander was landed on lunar surface, during
6 Power Technology of Lunar Lander
6.5.4 Design of Hibernation and Awakening Control
1. Technical Difficulties
Technical difficulties of hibernation and awakening control included two main
aspects. When the lunar night came, all equipment must be shut down completely. The
normal sequence for power-off implementation of the power controller of main bus
and the OBDH computer for command driving power were coupled. Therefore, the
power-off sequence for power controller and OBDH computer was cross coupled. So,
it was a technical difficulty to shut off the last instrument. When the lunar daytime
came, the lunar lander should be transferred from hibernation to awakening. The
awakening of the first equipment should work autonomously by the external input
conditions, and then other instruments were powered on according to predetermined
procedure to recover telecommand and telemetry of the lunar lander.
2. Implementation Method
After the telecommunication coverage, temperature adaptability, angle range of
solar array and power balance were considered for the lunar lander, hibernation
and autonomous awakening method were designed for solution. The instruments
of the lunar lander would be shut down subsequently by ground commands before
lunar night to hibernate. The awakening process was triggered by sunlight when the
solar array power output met the requirement for minimum operation mode load.
The awakening control circuit would send instruction autonomously to power on
battery packs, OBDH computer and power supply controller, and then power on other
instrument to implement transfer to the normal operation mode in lunar daytime.
3. Key Control Switch
The hibernation and awakening control circuit consisted of many key switches for
control of the power supply. The center of hibernation and awakening method was
to design the power on/off sequence of the key control switches.
4. Process of Hibernation and Awakening
The workflow diagram of hibernation and awakening is shown in Fig. 6.5.
6.5.5 Power Supply Reuse Between Probes
Due to strict mass constraint, additional mass would be necessary for the lunar lander
and the lunar rover if they used their own power system to provide energy.
For the Chang’ E-3 lunar lander, no additional mass was required by making full
use of original power supply controller modules of the lunar lander and the lunar rover.
The energy share circuit and logic control command and was designed to implement
energy share between the lunar lander and the lunar rover. The interface of energy
share is shown in Fig. 6.6. After the lunar lander was landed on lunar surface, during