can schottky diode be used to cut off the charging circuit? - Electronic Circuits Projects Diagrams Free

nandita · 28th October 2003, 10:29 AM

if the solar panel can source only 3 volts to a 3 volts rechargeable battery
is any overcharge prevention circuit required?

Can a schottky diode be used as a reverse current limiter between the solar panel and the battery?

Ravi · 28th October 2003, 11:13 AM

Suggest to use a diode in reverse bias to prevent battery discharging into the solar pannel when in the dark. A low voltage silicon diode would be sufficient.

Schottky diodes exhibit a forward voltage drop which is approximately half that of a conventional silicon diodes coupled with very fast reverse recovery. Schottky diodes are thus preferred in switching applications such as switch mode power supplies where very low forward voltage drop and fast switching is a prime consideration.

Klaus · 30th October 2003, 02:07 AM

However, since his solar panel has a marginal charging voltage already, a silicon diode in series would make this voltage -0.5V at the battery.
A Schottky diode can have as little as 0.1V drop at low currents so it would be a much better idea to use that. As a matter of fact, a lot of solar panels do have schottky diode reverse current blocking for this reason.

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28th October 2003, 10:29 AM	(permalink)
nandita	can schottky diode be used to cut off the charging circuit? if the solar panel can source only 3 volts to a 3 volts rechargeable battery is any overcharge prevention circuit required? Can a schottky diode be used as a reverse current limiter between the solar panel and the battery?

28th October 2003, 11:13 AM	(permalink)
Ravi	Suggest to use a diode in reverse bias to prevent battery discharging into the solar pannel when in the dark. A low voltage silicon diode would be sufficient. Schottky diodes exhibit a forward voltage drop which is approximately half that of a conventional silicon diodes coupled with very fast reverse recovery. Schottky diodes are thus preferred in switching applications such as switch mode power supplies where very low forward voltage drop and fast switching is a prime consideration. __________________ \"Waste your money and you\'re only out of money,but waste your time and you\'re lost part of your life\"

30th October 2003, 02:07 AM	(permalink)
Klaus	However, since his solar panel has a marginal charging voltage already, a silicon diode in series would make this voltage -0.5V at the battery. A Schottky diode can have as little as 0.1V drop at low currents so it would be a much better idea to use that. As a matter of fact, a lot of solar panels do have schottky diode reverse current blocking for this reason.