AN417 datasheet(11/21 Pages) STMICROELECTRONICS

Part #	AN417

Description	From nickel-cadmium to nickel-hydride fast battery charger

PDF	21 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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11 / 21 page

AN417

Test results

Doc ID 2074 Rev 2

11/21

Test results

Figure 7 and Figure 8 show curves of a NiCd battery charge respectively terminated by

Δ V] and inflexion point methods. A similar comparison is made with a NiMH battery in

Figure 9 and Figure 10. The charging current is 2.2 A, the NiCd battery was a 1.4 Ah type

and the NiMH battery a 2.2 Ah type. These measurement results clearly show that the

battery temperature increase is much smaller with the inflexion method than with the

conventional -[

Δ V] method. Moreover, these curves demonstrate that a one hour charge of

NiMH batteries can be properly monitored by the ST6210 MCU.

Figure 7.

Charge of a 1.4 Ah NiCd battery with the -[

Δ V] method: charging current 2.2 A, total

time 48 mn, temperature increase 9.6°C.

charging time

cell voltage

temperature

voltage

temperature

22.4 deg

32 deg

AN417 Datasheet(PDF) 11 Page - STMicroelectronics