jotron RCH-20, Руководство пользователя

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RCH-20
5-2
Charge control circuits
Each battery position has a separate switch to select charging. Q3 and Q7 are used to switch charging
on and off, and are controlled by output ports on IC1, to select which battery is going to be charged.
In addition to the voltage and temperature reading, an internal timer is used to terminate the charging
if no other termination occurs within approx 4.5 hours.
When there is no battery, or a fully charge battery is placed in the slot, the charger will send short
charging pulses to each slot. This is used to detect whether a battery is present in each slot, as well as
supplying trickle charge to fully charged batteries. The trickle charge is approx 10mA on average.
Status of the charging is indicated by D1 and D2, which are bicolour LED’s. The function of these
diodes is explained in chapter 4.