Service manual

Ultraview 1030/1050 Monitors — Service Manual

3-14

Battery Chargers

The battery chargers have the following features:

• Front panel LED battery charging/failure indicator.

• Automatic “battery care” recharge cycles to ensure a maximum charge.

• One or two batteries fully charge in 90 minutes if the system is not operating; 4 to 5 hours

while unit is operating.

• Individual battery chargers for each of the 2 batteries so that a bad battery will not degrade the

other battery. Will not prematurely “kill” batteries.

Figure 3-7: Charging circuit block diagram

12-to-24 V

DC input

charger pre-regulator

charger power converter

charger CPU IC

DC output

20 V

DC to DC converter

3.6 A max current at

20 VDC. MIC38HC43

IC chip, 100 KHz

Compute battery condition

Turn ON/OFF power converter IC

CPU controlled battery

battery charge rate

1.8 A max, 0.16 A min

Analog feedback

Using DC charge levels and

an AC waveforms, evaluate

battery internal condition

charger output to battery

+5 V

BTI CCS9620 IC chip

Convert 20 V to 10 V min and

15.1 V max; constant current

limited with constant voltage

limited; LT1511 IC chip

12 V lead

acid battery

battery fault

automatic fan control