Power Supply For Two Way Radios

BM1220A (12.8VDC @20.0A Battery Single Charger)

SPECIFICATION

GENERAL

Scope
This specification defines the performance characteristics of SMPS based 300Wmax., Float to Boost Charger Power Supply.

INPUT REQUIREMENTS

INPUT VOLTAGE RANGE
170VAC - 270VAC
INPUT FREQUENCY RANGE
50Hz ± 3Hz
INRUSH CURRENT
< 20A peak @ 230VAC,cold start @ 25º C.
INPUT CURRENT
< 3.0A rms @ 170VAC and output full load
EFFICIENCY
> 80% under all line conditions and full load.

OUTPUT CHARACTERISTICS

OUTPUT FLOAT VOLTAGE
13.70VDC ± 0.50V
OUTPUT BOOST VOLTAGE
14.70VDC ± 0.50V
OUTPUT CURRENT
20 .0Amp, ± 0.5A
RIPPLE
< 200mV. Pk - Pk, at Nominal Input
NOISE
< 400mV. Pk - Pk, at Nominal Input
(measured with 0.1μF ceramic disc & 10μF Electrolytic capacitor across output in 20 MHz bandwidth oscilloscope.)
OUTPUT OVER CURRENT LIMIT MIN. POINT
> 19.5Amp at all AC Input Conditions
OUTPUT OVER CURRENT LIMIT MAX. POINT
< 20.50Amp at all AC Input Conditions
BOOST-FLOAT CHANGE OVER CURRENT
3Amp - 5Amp current
FLOAT-BOOST CHANGE OVER
When ever discharged battery is connected to charger the output voltage goes to boost charging mode and will start charging the Battery. Once Battery is fully Charged the output voltage will change from boost to float mode and maintains the battery in fully charged Condition.

PROTECTIONS:

OUTPUT OVER LOAD / SHORT CIRCUIT PROTECTION
The power supply is fully protected against over load & short ckt. During over load output fold back and resumes to normal operation on removal of over loads. During short circuit at output the power supply will go in to hick up mode and resumes normal operation on Removal of the short circuit.
CHARGE CHANGE OVER PROTECTION
Once Battery is fully Charged the protection circuit changes from Boost mode to Float mode and it does not allow further charging. During charging time when ever the battery charging current reduces to 4.0A ± 1.0A the output will change from boost to float mode.
BATTERY REVERSE PROTECTION
On Battery reversal, 30A fuse mounted on the PCB will blow, The power supply is isolating from the Battery.

ENVIRONMENT

TEMPERATURE
Operation Ambient 0ºC to + 50ºC ambient.
Storage 0ºC to + 75ºC ambient.
HUMIDITY
Operating 5% RH to 95% RH non-condensing.
Storage 5% RH to 95% RH non-condensing.

PRODUCT SAFETY:

DI-ELECTRIC VOLTAGE WITHSTAND TEST
Tested at 3.0KVAC rms at 50Hz for 60 Sec. with a trip current of 5mA.
1. Between INPUT and OUTPUT.
INSULATION RESISTANCE
When tested with a 500VDC Megger shall not be < 20 Mega Ohms Between Shorted INPUT and Shorted OUTPUT Terminals.

EMI/EMC:

CONDUCTED & RADIATED EMISSION
Designed to meet CISPR22 CLASS-A

MTBF:

25,000 hours at full load and 25ºC ambient conditions.

INDICATIONS :

OUTPUT ON & BATTERY FULLY CHARGE
GREEN LED is provided to indicates mains ON & Battery is fully Charged.
BATTERY CHARGING
RED LED is provided to indicate battery charging.

OVER TEMPERATURE PROTECTION:

The power supply is protected against over temperature. In case of over temperature the power supply output gradually reduced, O/P Power limits & recovers normal operation automatically when the temperature reduces.

DISPLAY METERING

VOLTMETER
0 to 20V analog voltmeter provided on the front panel to read the Load and battery voltage.
AMMETER
0 to 25A analog ammeter provided on the front panel to read the Load and battery currents.

COOLING

Forced air cooling.

PACKING

INNER PACKING
A transulant polythene cover of suitable dimension.
OUTER PACKING
A white child carton of suitable size.

ENCLOSURE

DIMENSIONS
WIDTH : 242mm , DEPTH : 255mm , HEIGHT : 96mm
WEIGHT
3.0 kgs