Charging Indication; Technical Specifications; Charge States And Charge Control - Nokia 2160 Technical Documentation Manual

Desktop Charger CHH–2

Charging Indication

Charge is indicated with two dual–colors led's, one for the phone and one
for the extra battery pack. The liquid–crystal display of the phone also
contains a three–bar battery display.
Led's are dim when there is no phone or extra battery connected.
Right led for handportable:
Red phone led indicates a fast charge mode of the phone battery.
Green phone led indicates a tricle (maintenance) charge mode of the
phone battery; with steady lcd battery display it means that the battery is
full. If the led is green but the battery display is scrolling, charging is dis-
abled due to battery temperature (less than +5 or more than +45 Centi-
grade).
Left led for spare battery:
Red spare battery led indicates that the battery is not full; either there is a
fast charge mode active or charging is disabled due to a battery tempera-
ture or to fast charge mode of the phone.
Green spare battery led indicates that the battery is full.
Flashing red spare battery led indicates that a discharge cycle is acti-
vated.

Technical Specifications

Charge States and Charge Control

Charge current for the phone is supplied through a series switch transis-
tor in the phone. When this transistor is on the charger is supplying a
constant current to the phone. This is the rapid charge mode.
When the transistor is off no current is supplied to the phone and the
charger is in the constant voltage mode.
Having been charged up in the rapid charge mode, the battery is kept in
full charge using pulsed charging, i.e. switching power alternately on and
off at a variable duty cycle and a frequency of a few Hz.
The desktop charger is also provided with control logic for spare battery
charging, which is allowed when no phone is connected or when the
phone is in the pulsed charge mode.
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