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Power Supply
The Robomower uses an external power supply to provide the required energy for charging while
an on board computer controls the actual battery charging process.
The Power Supply is manufacturing by Eng. ELECTRIC Co. LTD
Friendly Robotics uses two power supply models:
A – Input: 120VAC 60 Hz 38 W
Output: 32VDC 900mA
This model is UL approved
B – Input: 230VAC 50 Hz 40 W
Output: 31VDC 900mA
This model is CE approved
6.2.2 Charging procedure
The charging cycle is divided into 3 stages* as follows:
Stage 1:
The Input voltage is maximal.
The time it takes to reach this voltage (T1) is recorded and will be used at later stage.
If T1 < 5 minutes and battery voltage is higher than 28V, we will skip stage 2 and move to the
Floating stage.
If T1 >= 5 minutes and battery voltage is higher than 29.4V, we will move to stage 2.
Stage 2:
The voltage controller keeps the Input voltage at 29.4V.
The charging process will proceeds to the Floating stage after T1/2 hours if T > 6 hours or after 6
hours if T1 <= 6 hours
Stage 4 (Floating):
The voltage controller keeps the Input voltage at “floating” voltage of 27.2V and stays as is until
charging process is terminated.
Top Charging
Top Charging is a recommended process to be applied to any battery, which has been stored
for a long period of time, since the battery loses capacity through self-discharge.
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