Battery charger, Battery connector J1

Users Manual & Installation Guide

PV- 1075: NIMH BATTERY PACK WITH CHARGER

Battery connector (J1)

The NiMH battery is connected to PV-1075 using J1 that is a two-pole MOLEX connector. The battery connector is disconnected at delivery to prevent deep discharge of the battery when not used for a longer period.

PC/104 connector (CN1)

PV-1075 is attached the PC/104 stack using CN1. There are no electrical connection to this connector and serves only to bypass the PC/104-bus in the stack.

Battery charger

The battery charger controls the charging process using two modes:

•standard charge mode with charging current = 50mA and

•trickle charge mode with charging current = 25mA.

The switching between these modes is determined by a counter which is controlled by the ‘presence’ of mains. There are two input frequencies to this counter: one used during the presence of mains input and one used when there are no mains input. The two frequencies have a mutual ratio of 32 where the lowest frequency is used during count-up. During the presence of mains, the counter counts up. When mains disappear, the counter counts down. The charging progress is illustrated below:

Charging indicators

Two LEDs indicate the actual charging mode: D4 (yellow) indicate Standard Charge and D9 (green) indicate Trickle Charge. These LEDs are located on the component side.

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