rc oscillator

The design is based on Philips P89LPC916 MCU core, the general conception is that by first using constant curent charge, then use the constant voltage charging to reach the load as son as posible. Precision VD power requires the use of the precision voltage source, because this voltage is used as a reference DA-DA voltage converter. A switch PWM charge control, and its duty cycle as required charging voltage and curent fedback to adjust. Del Inspiron 1501 batery Del Inspiron 1525 batery The next step is to calculate the inductance value, we must first emphasize that the formula gives a duty cycle, output curent, the PWM cycle and the relationship betwen other variables. Inductance value can be asumed that Vi 5.1V, output voltage Vsat 0.5V required at Io 350mA on, , Vo 4.25V, the necesary output curent Io 350mA, 1 / T 14.7kHz and the duty ratio of 50% calculated . Once the batery voltage reaches 3V -1%, which entered the stage of rapid charging, and using a constant curent load 350mA. When the batery voltage reaches 4V -1%, which starts at a constant voltage phase. Del Inspiron 1526 batery Del Inspiron 1720 batery In a constant voltage phase, the batery is charging an extra 50 minutes while maintaining the load curent is les than 30 mA. phase Fast Charge charge curent : When Vbat < 4.0 / -1% V, seting Iout 350mA Ireg timer control, the loading phase constant voltage : When Ibat 60mA, Vout set 4.23V Vreg 50 minutes to ensure that the batery fuly charged but the charge curent is below 30mA. When charging begins, every 15 seconds of recording time data, but the stability of curent and voltage, the registration period may be reduced to once every 5 seconds record.
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