Wednesday, February 18, 2009

b)Diode Circuit

Diode Circuit


A) Freewheeling Diode Circuit



Basic circuit diagram: freewheeling diode




Fig. Switching over voltage of a contactor with diode


Advantage: Switching over voltage limited to 0.7 volt

Disadvantage:
Breaking delay, breaking time increased by a factor 6 to 9.

Note:
Above disadvantage can be used to your advantage if, for example, a temporary voltage drop of around several milliseconds has to be bridged



B) Circuit with One Diode / Zener Diode Diode Assembly





Fig. Basic circuit diagram: diode assembly





Fig. : Switching over voltage of a contactor zener & diode


Advantage:
Switching over voltage limited to 10 volt

Disadvantage:
Breaking delay, breaking time increased by a factor 2 to 6

Note:
Above disadvantage can be used to your advantage if, for example, a temporary voltage drop of around several milliseconds has to be bridged


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