Bidirectional 4 Cell Li-Ion Charger Reference Design
Created: Sep 03, 2014
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In our society nowadays, the usage of high-power portable applications persistently emerges, thus the use of more advanced and new techniques are needed to power up batteries that do not only provide low regulated voltage but can also be used on latest digital electronics. Portable equipment needs more power than a one or two cell Li-Ion battery packs can store energy efficiently. This would result to a difficult high voltage to low voltage DC-DC conversion. This reference design features MCP1630V Bidirectional 4 Cell Li-Ion Charger that can be used to evaluate a design which boosts a low source voltage to charge four Li-Ion series cells while simultaneously providing energy to the system. Despite the source is removed, the same powertrain used to charge the battery pack will provide a low regulated voltage that will then operate the system.
The MCP1630V Bidirectional 4 Cell Li-Ion Charger reference design demonstrates Microchip's high speed pulse width modulator (PWM) that is used in a four cell Li-Ion battery charger combined power supply application. When used in conjunction with a microcontroller, the MCP1630V will control the power system duty cycle to provide regulated output voltage or current. The PIC16F88 microcontroller oscillator output is used to provide pulses at switching frequency of 500 kHz. The MCP1630V generates duty cycle based on various external inputs. External signals include the input oscillator pulses from PIC16F88, the reference voltage and the feedback voltage. The output signal is a square wave pulse provided to the synchronous gate drive input. The synchronous gate driver is used to turn ON and OFF the upper buck MOSFET and lower synchronous MOSFET.
This reference design that uses MCP1603 Microchip microcontroller can be used in various applications such as intelligent power systems, smart battery charger applications, multiple output/multiple phase converters, output voltage calibration, AC power factor correction, VID capability, Buck/Boost/SEPIC/flyback converters and parallel power supplies.