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Autonomous Fast NiMH Battery Charger Using Single Chip IC

2016-05-11 09:53  
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This simple Batteries charger circuit is designed for NiMH/NiCd batteries. Itneed no micro-controller nor any programming.Linear Technology Corporation produce the  LTC4060,  an autonomous 1- to 4-cell, 0.4A to 2A linear NiMH and NiCd battery charger complete controller. Here are the main features:

 

No Sense Resistor or Blocking Diode RequiredComplete Fast Charger Controller for Single, 2-, 3- or 4-Series Cell NiMH/NiCd BatteriesAutomatic Detection of BatteryPrecharge for Heavily Discharged BatteriesOptional Temperature Qualified ChargingCharge and AC Present Status Outputs Can Drive LEDAutomatic Recharge Keeps Batteries ChargedProgrammable Fast Charge Current: 0.4A to 2AAccurate Charge Current: ±5% at 2AFast Charge Current Programmable Beyond 2A with
External Sense ResistorManual ShutdownNo Firmware or Microcontroller RequiredTermination by –?V, Maximum Voltage or Maximum TimeInput Supply Range: 4.5V to 10VAvailable in 16-Lead DFN and TSSOP PackagesAutomatic Sleep Mode with Input Supply RemovalNegligible Battery Drain in Sleep Mode: <1μA

The LTC4060 includes all the functions required to build a battery charger circuit, need no microcontroller or firmware. The LTC4060 eliminates the need for a sense resistor and blocking diode, which improve efficiency and the cost effectiveness. This IC chip is suitable for many application such as portable medical equipment, automotive diagnostic systems and industrial/telecommunication test devices.

automatic nimh chager circuit schematic

The circuit schematic diagram shown in the figure above is an application that utilizes the optional battery temperature monitoring and optional externally programmable automatic recharge features. It also provides LEDs to indicate charging status and the presence of appropriate input supply voltage. The PROG pin is connected to a total resistance of 691 Ohm to ground that programs the fast-charge current at the PNP’s emitter to 2.02A (2A at the collector for beta of 100). The ARCT pin voltage is programmed to 1.25V. When the battery cell voltage falls below this low level threshold then an automatic recharge will begin. Optional capacitor CBAT is needed to filter out excessive contact bounces. To modify for charging a 4A-Hr battery at a C/2 rate, simply double the CTIMER capacitance. [Circuit's schematic diagram source: Linear Technology LTC4060 Application Notes]



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