List of figures

AN417

4/21

Doc ID 2074 Rev 2

List of figures

Figure 1.

Battery charger circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2.

The negative delta voltage method fast charge is terminated at point A . . . . . . . . . . . . . . . 6

Figure 3.

Fast charge terminates at point B in the inflexion point method . . . . . . . . . . . . . . . . . . . . . . 7

Figure 4.

NiMH versus NiCd charging characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 5.

Inflexion point method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 6.

Simplified program flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 8.

Charge of a 1.4 Ah NiCd battery with the inflexion method: charging current 2.2 A,

total time 41 mn, temperature increase 5°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 9.

Charge of a 2.2 Ah NiMH battery with the -[

Δ V] method: charging current 2.2 A, total

time 63 mn, temperature increase 18.2°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 10.

Charge of a 2.2 Ah NiMH battery with the inflexion method: charging current 2.2 A,

total time 57 mn, temperature increase 7.5°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 11.

Block diagram of an off-line SMPS charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 12.

Block diagram of a DC/DC charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 13.

This 35W/100kHz off-line charger is an asymmetrical half-bridge regulated in current

mode from its primary side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 14.

This 15W/100kHz DC-to-DC charger is also driven by a low-cost PWM control

integrated circuit, the UC3843 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17