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Devices Supported: MCP1630, PIC12F683, MCP1702, MCP6292
Summary Description:
Low Cost NiMH Battery Charger board preprogrammed to charge 3 NiMH cells. Charge profile and number of batteries can be changed with firmware. The design uses the MCP1630 High-Speed Analog PWM combined with the PIC microcontroller. Charge current is initially set for 1.35A fast charge.
Features:
- Programmed parameters - modified in firmware
- Factory Settings:
- Preconditioning Charge Current =170 mA
- Preconditioning Threshold = 3 V
- Constant Current Fast Charge = 1.35 A
- Charge Termination based on delta - VBATT / delta time
- Charge Termination based on delta + TBATT / delta time, with external thermistor installed - Top Off Charge Current = 130 mA for 1 Hour
- Overvoltage protection (battery removed)
- Overcharge protection to prevent damaging the battery
- Overcurrent protection in the event of a shorted battery
- Battery reversal protection
- Input short circuit protection
- Overtemperature protection to prevent the battery from reaching too high a temperature during charge
- Soft-start capability by holding the reference voltage low during power-up
- The MCP1630 Low-Cost NiMH Battery Charger has the flexibility to optimize the charging algorithm for new battery technology, different battery chemistries or different battery pack configurations
- Proprietary features can be added by modifying the firmware contained in the PIC12F683
- The factory-programmed source code is available
- Ability to adapt to environmental effects, such as ambient temperature
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