Principles Of Operation - Samlexpower SEC-1280UL Owner's Manual

Switch mode, automatic, lead acid battery charger

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Owner's manual (64 pages)

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SECTION 4 |

INFO

For complete understanding of working of battery chargers, understanding of

operation of Lead Acid batteries is desirable.

For detailed information on construction, working and application of batteries,

please refer to White Paper titled "Batteries, Chargers and Alternators" at the

following link to Samlex America, Inc. website:

www.samlexamerica.com/support/whitepapers.aspx

4.1 SWITCH MODE POWER SUPPLY (SMPS) CHARGER

This unit is a Switched Mode Power Supply (SMPS) and charger that converts 120 / 230

VAC, 50 / 60 Hz to regulated DC voltages and limits the maximum output current equal

to the rated Bulk Stage Current (Current Limit Value) as shown in Table 4.1.

TABLE 4.1 CHARGING STAGE VOLTAGES AND CURRENTS

Model No.

SEC-1280UL

SEC-2440UL

The specified output voltage of the charger during particular charging stage is held

constant till the Bulk Stage Current value is reached. When the battery or DC load tries

to draw current > the Bulk Stage Current value (80A for SEC-1280UL & 40A for SEC-

2440UL), the charger limits the current to the Bulk Stage Current value and the output

voltage of the charger drops and is no longer constant. When the charger is charging a

battery at current = the Bulk Stage Current, it will be in current limit condition and the

terminal voltage of the charger will drop but will be clamped to the actual lower intrin-

sic terminal voltage of the battery relative to its Stage of Charge at that time.

8 | SAMLEX AMERICA INC.