Play listen 8 smart charger-12. finally implement-DV detection (switch)

Source: http://blog.chinaunix.net/uid-10701701-id-91873.html

 

2010.1.3
Finally completed. The DV detection series of battery charging pictures, please move:

Http://blog.chinaunix.net/u2/79526/showart_2137867.html
Method:

1) In the ADC part, the hardware RC filtering, the software continuously obtains 5 ADC values for each measurement, removes the highest and lowest values, and finally obtains the average value for the rest.

2) record the maximum voltage value. Once a voltage value is reached, it is recorded in the top variable. if the voltage drops to top-200 for three consecutive times, confirm-DV and the charging is complete.

3) as long as the top node is exceeded, the-DV count is reset.

if( ic->top_voltage > (ic->voltage+0.012) ){            ic->delta_times++;          infon("   -dV:",ic->delta_times);         _delay_s(2);            if(ic->delta_times >3){             ic->i_stage = STOP; /*STOP and update abs voltage*/             lcd_cursor(0,0);             lcd_puts("END:");             short x = 1000*ic->voltage;             print10(x);              pwm_setduty(0);         } } 

 

Two mah batteries are charged:
800 mah nicd1

Start Charging 340mah End Time 1.543 --- 1.5a total end time <(Estimated end time, 2c)

Top1896, end 1882, end voltage: 1.38 after 10 mintes 1.371

800 mah nicd2

Start charging at 340 .. 358 mah End Time: 3: 47 1.568 --- 1.3a total end time (Estimated end time:, 600mha ?, 2c) (punch in: About Mha)

Top 2063, end 2048, end voltage: 1.470, after 10 minites: 1.42

Internal Resistance 0.25r, can only be rushed into 500 Mah, in fact, it must be less, 400mah is good, test, rotten battery.

Play listen 8 smart charger-12. finally implement-DV detection (switch)