Diode type with lowest drop voltageLowest voltage drop diode possibleUnderstanding an 'ideal' diode made from a p-channel MOSFET and PNP transistorsFlyback diode forward voltage dropHarvesting Energy from an Electromagnetic GeneratorDiode Bridge Rectifier using Dual Schottkey Diode BridgeVoltage drop across a diodeLowest voltage drop diode possibleWhat should I keep instead of this energy harvester breakout for maximum efficiency of the solar and supercaps circuit?Type of Diode for Solar PanelHow to design a low voltage astable multiviratorHarvesting energy from solar and “USB”Mosfet or bjt choice for low voltage joule thief application
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Diode type with lowest drop voltage
Lowest voltage drop diode possibleUnderstanding an 'ideal' diode made from a p-channel MOSFET and PNP transistorsFlyback diode forward voltage dropHarvesting Energy from an Electromagnetic GeneratorDiode Bridge Rectifier using Dual Schottkey Diode BridgeVoltage drop across a diodeLowest voltage drop diode possibleWhat should I keep instead of this energy harvester breakout for maximum efficiency of the solar and supercaps circuit?Type of Diode for Solar PanelHow to design a low voltage astable multiviratorHarvesting energy from solar and “USB”Mosfet or bjt choice for low voltage joule thief application
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
$begingroup$
I make a small solar energy harvester. I'm searching for the type of diode with lowest drop voltage. Any suggestion for the type of diode for me ?
Thank you
diodes boost low-power solar-energy energy-harvesting
asked 8 hours ago
Back LinkBack Link
112
New contributor
Back Link is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
|
show 1 more comment
$begingroup$
I make a small solar energy harvester. I'm searching for the type of diode with lowest drop voltage. Any suggestion for the type of diode for me ?
Thank you
diodes boost low-power solar-energy energy-harvesting
asked 8 hours ago
Back LinkBack Link
112
New contributor
Back Link is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
1
$begingroup$
If you study diodes, they don't have a threshold voltage as such but sometimes it's convenient to refer to a value between 0.5 volts and 1 volt. Try looking for schottky diodes as they have the lowest forward volt drop for a given current. Germanium diodes are also worth looking at but their availability and reliability is somewhat degraded.
$endgroup$
– Andy aka
8 hours ago
$begingroup$
Thanks for your answer, i used 1N4148 diode, may be any diode better than 1N4148
$endgroup$
– Back Link
8 hours ago
1
$begingroup$
How exactly do you intend to use them?
$endgroup$
– Lundin
8 hours ago
1
$begingroup$
In series with the supply? Then you definitely need a different diode. There's specialized fast diodes suitable for use together with regulators, for example. I would advise you to post a simple schematic on this site (there's a free schematic tool you can use) and ask for feedback about component choice.
$endgroup$
– Lundin
7 hours ago
1
$begingroup$
Possible duplicate of Lowest voltage drop diode possible
$endgroup$
– dim
4 hours ago
|
show 1 more comment
$begingroup$
I make a small solar energy harvester. I'm searching for the type of diode with lowest drop voltage. Any suggestion for the type of diode for me ?
Thank you
diodes boost low-power solar-energy energy-harvesting
asked 8 hours ago
Back LinkBack Link
112
New contributor
Back Link is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
I make a small solar energy harvester. I'm searching for the type of diode with lowest drop voltage. Any suggestion for the type of diode for me ?
Thank you
diodes boost low-power solar-energy energy-harvesting
diodes boost low-power solar-energy energy-harvesting
asked 8 hours ago
Back LinkBack Link
112
New contributor
Back Link is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
Back LinkBack Link
112
New contributor
Back Link is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 8 hours ago
Back Link
asked 8 hours ago
Back LinkBack Link
112
New contributor
Back Link is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
Back LinkBack Link
112
asked 8 hours ago
Back LinkBack Link
112
112
New contributor
Back Link is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Back Link is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
$begingroup$
If you study diodes, they don't have a threshold voltage as such but sometimes it's convenient to refer to a value between 0.5 volts and 1 volt. Try looking for schottky diodes as they have the lowest forward volt drop for a given current. Germanium diodes are also worth looking at but their availability and reliability is somewhat degraded.
$endgroup$
– Andy aka
8 hours ago
$begingroup$
Thanks for your answer, i used 1N4148 diode, may be any diode better than 1N4148
$endgroup$
– Back Link
8 hours ago
1
$begingroup$
How exactly do you intend to use them?
$endgroup$
– Lundin
8 hours ago
1
$begingroup$
In series with the supply? Then you definitely need a different diode. There's specialized fast diodes suitable for use together with regulators, for example. I would advise you to post a simple schematic on this site (there's a free schematic tool you can use) and ask for feedback about component choice.
$endgroup$
– Lundin
7 hours ago
1
$begingroup$
Possible duplicate of Lowest voltage drop diode possible
$endgroup$
– dim
4 hours ago
|
show 1 more comment
1
$begingroup$
If you study diodes, they don't have a threshold voltage as such but sometimes it's convenient to refer to a value between 0.5 volts and 1 volt. Try looking for schottky diodes as they have the lowest forward volt drop for a given current. Germanium diodes are also worth looking at but their availability and reliability is somewhat degraded.
$endgroup$
– Andy aka
8 hours ago
$begingroup$
Thanks for your answer, i used 1N4148 diode, may be any diode better than 1N4148
$endgroup$
– Back Link
8 hours ago
1
$begingroup$
How exactly do you intend to use them?
$endgroup$
– Lundin
8 hours ago
1
$begingroup$
In series with the supply? Then you definitely need a different diode. There's specialized fast diodes suitable for use together with regulators, for example. I would advise you to post a simple schematic on this site (there's a free schematic tool you can use) and ask for feedback about component choice.
$endgroup$
– Lundin
7 hours ago
1
$begingroup$
Possible duplicate of Lowest voltage drop diode possible
$endgroup$
– dim
4 hours ago
1
1
$begingroup$
If you study diodes, they don't have a threshold voltage as such but sometimes it's convenient to refer to a value between 0.5 volts and 1 volt. Try looking for schottky diodes as they have the lowest forward volt drop for a given current. Germanium diodes are also worth looking at but their availability and reliability is somewhat degraded.
$endgroup$
– Andy aka
8 hours ago
$begingroup$
If you study diodes, they don't have a threshold voltage as such but sometimes it's convenient to refer to a value between 0.5 volts and 1 volt. Try looking for schottky diodes as they have the lowest forward volt drop for a given current. Germanium diodes are also worth looking at but their availability and reliability is somewhat degraded.
$endgroup$
– Andy aka
8 hours ago
$begingroup$
Thanks for your answer, i used 1N4148 diode, may be any diode better than 1N4148
$endgroup$
– Back Link
8 hours ago
$begingroup$
Thanks for your answer, i used 1N4148 diode, may be any diode better than 1N4148
$endgroup$
– Back Link
8 hours ago
1
1
$begingroup$
How exactly do you intend to use them?
$endgroup$
– Lundin
8 hours ago
$begingroup$
How exactly do you intend to use them?
$endgroup$
– Lundin
8 hours ago
1
1
$begingroup$
In series with the supply? Then you definitely need a different diode. There's specialized fast diodes suitable for use together with regulators, for example. I would advise you to post a simple schematic on this site (there's a free schematic tool you can use) and ask for feedback about component choice.
$endgroup$
– Lundin
7 hours ago
$begingroup$
In series with the supply? Then you definitely need a different diode. There's specialized fast diodes suitable for use together with regulators, for example. I would advise you to post a simple schematic on this site (there's a free schematic tool you can use) and ask for feedback about component choice.
$endgroup$
– Lundin
7 hours ago
1
1
$begingroup$
Possible duplicate of Lowest voltage drop diode possible
$endgroup$
– dim
4 hours ago
$begingroup$
Possible duplicate of Lowest voltage drop diode possible
$endgroup$
– dim
4 hours ago
|
show 1 more comment
5 Answers
5
active
oldest
votes
$begingroup$
You can try something like the 1N5817 Schottky diode, but note that lower drop goes hand-in-glove with higher reverse leakage (particularly egregious at higher temperatures).
answered 8 hours ago
Spehro PefhanySpehro Pefhany
217k5166442
$endgroup$
$begingroup$
@SpehroThanks for your suggestion
$endgroup$
– Back Link
7 hours ago
add a comment |
$begingroup$
For harvesting low voltage, you might want to consider the ideal diode using 1 FET , 2R’s and an IC or buy the board online.
Understanding an 'ideal' diode made from a p-channel MOSFET and PNP transistors
Or if the cost justifies a better solution, this energy harvesting IC BQ25505 which specs include :
– Ultra-Low Quiescent Current of 325 nA.
– Input Voltage Regulation Prevents Collapsing High-Impedance Input Sources
answered 5 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
74.4k228106
$endgroup$
add a comment |
$begingroup$
Most diodes will be better than 1N4148. Diodes for higher current will usually have less voltage drop at lower current. As Andy says, Schottky diodes will have lowest voltage drop. At about 200 mA voltage drops for common diodes are (from various datasheets):
DIODE Vdrop @ 200 mA Diode type
1N4148 1.0 Signal
1N4007 0.8 General rectifier (1A)
1N5408 0.6 General rectifier (3A)
1N5817 0.25 Schottky (1A)
1N5820 0.2 Schottky (3A)
answered 8 hours ago
IndraneelIndraneel
1,3901715
$endgroup$
$begingroup$
Recently I measure the 1N4148 on my circuit at anode and cathode, the avometer show 0.16v, would you like to explain to me about that?, i'm newbie in electrical, Thank you
$endgroup$
– Back Link
7 hours ago
$begingroup$
@BackLink en.wikipedia.org/wiki/Diode_modelling#Graphical_solution
$endgroup$
– Sean Houlihane
7 hours ago
$begingroup$
@SeanHoulihane understand this. On a Log I vs linear V diodes are a straight slope until bulk Rs takes over then on a Linear I vs V it is a straight slope . Aka stepwise approximation aka linear regression, so some Schottky diodes reach the same as silicon or more when higher than rated using pulsed currents.
$endgroup$
– Sunnyskyguy EE75
5 hours ago
1
$begingroup$
@BackLink What was the current flow through the diode? At negligible current flow, you can get very low voltage drop across the diode. This is why it is not always a good idea to power sleeping chips through diodes. If current draw reaches uA levels, the voltage supplied to the chip may exceed specifications. One cannot blindly use 0.7 V as diode drop. Check the datasheet to see the minimum current specified on the charts.
$endgroup$
– Indraneel
2 hours ago
add a comment |
$begingroup$
Firstly you should post a quick schematic of what you're working with. Schottky diodes are the kind with the lowest voltage drop. But your common models will still drop around 2mV.
There are ways to achieve the same result as using a diode, without the voltage drop. But it's more complicated and would depend on your design.
For solar energy harvesting though, you should be fine with a single Schottky between your panel and the rest of your design. Something like a 30V/3A would work with your average panel and have a pretty low voltage drop. Of course that all depends on what panel(s) you are using and what is connected to them...
answered 5 hours ago
heketehekete
526
$endgroup$
1
$begingroup$
"Schottky diodes ... common models will still drop around 2mV." - Did you mean 200mV?
$endgroup$
– marcelm
4 hours ago
add a comment |
$begingroup$
If you are just using the diodes to mux two power sources then you can use an ideal diode chip.
https://www.analog.com/en/parametricsearch/11029
They typically consume micro-amps of current. The forward voltage drop is usually only a few mV.
answered 4 hours ago
user4574user4574
3,657512
$endgroup$
add a comment |
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5 Answers
5
active
oldest
votes
5 Answers
5
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
You can try something like the 1N5817 Schottky diode, but note that lower drop goes hand-in-glove with higher reverse leakage (particularly egregious at higher temperatures).
answered 8 hours ago
Spehro PefhanySpehro Pefhany
217k5166442
$endgroup$
$begingroup$
@SpehroThanks for your suggestion
$endgroup$
– Back Link
7 hours ago
add a comment |
$begingroup$
You can try something like the 1N5817 Schottky diode, but note that lower drop goes hand-in-glove with higher reverse leakage (particularly egregious at higher temperatures).
answered 8 hours ago
Spehro PefhanySpehro Pefhany
217k5166442
$endgroup$
$begingroup$
@SpehroThanks for your suggestion
$endgroup$
– Back Link
7 hours ago
add a comment |
$begingroup$
You can try something like the 1N5817 Schottky diode, but note that lower drop goes hand-in-glove with higher reverse leakage (particularly egregious at higher temperatures).
answered 8 hours ago
Spehro PefhanySpehro Pefhany
217k5166442
$endgroup$
You can try something like the 1N5817 Schottky diode, but note that lower drop goes hand-in-glove with higher reverse leakage (particularly egregious at higher temperatures).
answered 8 hours ago
Spehro PefhanySpehro Pefhany
217k5166442
answered 8 hours ago
Spehro PefhanySpehro Pefhany
217k5166442
answered 8 hours ago
Spehro PefhanySpehro Pefhany
217k5166442
answered 8 hours ago
Spehro PefhanySpehro Pefhany
217k5166442
217k5166442
$begingroup$
@SpehroThanks for your suggestion
$endgroup$
– Back Link
7 hours ago
add a comment |
$begingroup$
@SpehroThanks for your suggestion
$endgroup$
– Back Link
7 hours ago
$begingroup$
@SpehroThanks for your suggestion
$endgroup$
– Back Link
7 hours ago
$begingroup$
@SpehroThanks for your suggestion
$endgroup$
– Back Link
7 hours ago
add a comment |
$begingroup$
For harvesting low voltage, you might want to consider the ideal diode using 1 FET , 2R’s and an IC or buy the board online.
Understanding an 'ideal' diode made from a p-channel MOSFET and PNP transistors
Or if the cost justifies a better solution, this energy harvesting IC BQ25505 which specs include :
– Ultra-Low Quiescent Current of 325 nA.
– Input Voltage Regulation Prevents Collapsing High-Impedance Input Sources
answered 5 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
74.4k228106
$endgroup$
add a comment |
$begingroup$
For harvesting low voltage, you might want to consider the ideal diode using 1 FET , 2R’s and an IC or buy the board online.
Understanding an 'ideal' diode made from a p-channel MOSFET and PNP transistors
Or if the cost justifies a better solution, this energy harvesting IC BQ25505 which specs include :
– Ultra-Low Quiescent Current of 325 nA.
– Input Voltage Regulation Prevents Collapsing High-Impedance Input Sources
answered 5 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
74.4k228106
$endgroup$
add a comment |
$begingroup$
For harvesting low voltage, you might want to consider the ideal diode using 1 FET , 2R’s and an IC or buy the board online.
Understanding an 'ideal' diode made from a p-channel MOSFET and PNP transistors
Or if the cost justifies a better solution, this energy harvesting IC BQ25505 which specs include :
– Ultra-Low Quiescent Current of 325 nA.
– Input Voltage Regulation Prevents Collapsing High-Impedance Input Sources
answered 5 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
74.4k228106
$endgroup$
For harvesting low voltage, you might want to consider the ideal diode using 1 FET , 2R’s and an IC or buy the board online.
Understanding an 'ideal' diode made from a p-channel MOSFET and PNP transistors
Or if the cost justifies a better solution, this energy harvesting IC BQ25505 which specs include :
– Ultra-Low Quiescent Current of 325 nA.
– Input Voltage Regulation Prevents Collapsing High-Impedance Input Sources
answered 5 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
74.4k228106
edited 5 hours ago
answered 5 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
74.4k228106
answered 5 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
74.4k228106
answered 5 hours ago
Sunnyskyguy EE75Sunnyskyguy EE75
74.4k228106
74.4k228106
add a comment |
add a comment |
$begingroup$
Most diodes will be better than 1N4148. Diodes for higher current will usually have less voltage drop at lower current. As Andy says, Schottky diodes will have lowest voltage drop. At about 200 mA voltage drops for common diodes are (from various datasheets):
DIODE Vdrop @ 200 mA Diode type
1N4148 1.0 Signal
1N4007 0.8 General rectifier (1A)
1N5408 0.6 General rectifier (3A)
1N5817 0.25 Schottky (1A)
1N5820 0.2 Schottky (3A)
answered 8 hours ago
IndraneelIndraneel
1,3901715
$endgroup$
$begingroup$
Recently I measure the 1N4148 on my circuit at anode and cathode, the avometer show 0.16v, would you like to explain to me about that?, i'm newbie in electrical, Thank you
$endgroup$
– Back Link
7 hours ago
$begingroup$
@BackLink en.wikipedia.org/wiki/Diode_modelling#Graphical_solution
$endgroup$
– Sean Houlihane
7 hours ago
$begingroup$
@SeanHoulihane understand this. On a Log I vs linear V diodes are a straight slope until bulk Rs takes over then on a Linear I vs V it is a straight slope . Aka stepwise approximation aka linear regression, so some Schottky diodes reach the same as silicon or more when higher than rated using pulsed currents.
$endgroup$
– Sunnyskyguy EE75
5 hours ago
1
$begingroup$
@BackLink What was the current flow through the diode? At negligible current flow, you can get very low voltage drop across the diode. This is why it is not always a good idea to power sleeping chips through diodes. If current draw reaches uA levels, the voltage supplied to the chip may exceed specifications. One cannot blindly use 0.7 V as diode drop. Check the datasheet to see the minimum current specified on the charts.
$endgroup$
– Indraneel
2 hours ago
add a comment |
$begingroup$
Most diodes will be better than 1N4148. Diodes for higher current will usually have less voltage drop at lower current. As Andy says, Schottky diodes will have lowest voltage drop. At about 200 mA voltage drops for common diodes are (from various datasheets):
DIODE Vdrop @ 200 mA Diode type
1N4148 1.0 Signal
1N4007 0.8 General rectifier (1A)
1N5408 0.6 General rectifier (3A)
1N5817 0.25 Schottky (1A)
1N5820 0.2 Schottky (3A)
answered 8 hours ago
IndraneelIndraneel
1,3901715
$endgroup$
$begingroup$
Recently I measure the 1N4148 on my circuit at anode and cathode, the avometer show 0.16v, would you like to explain to me about that?, i'm newbie in electrical, Thank you
$endgroup$
– Back Link
7 hours ago
$begingroup$
@BackLink en.wikipedia.org/wiki/Diode_modelling#Graphical_solution
$endgroup$
– Sean Houlihane
7 hours ago
$begingroup$
@SeanHoulihane understand this. On a Log I vs linear V diodes are a straight slope until bulk Rs takes over then on a Linear I vs V it is a straight slope . Aka stepwise approximation aka linear regression, so some Schottky diodes reach the same as silicon or more when higher than rated using pulsed currents.
$endgroup$
– Sunnyskyguy EE75
5 hours ago
1
$begingroup$
@BackLink What was the current flow through the diode? At negligible current flow, you can get very low voltage drop across the diode. This is why it is not always a good idea to power sleeping chips through diodes. If current draw reaches uA levels, the voltage supplied to the chip may exceed specifications. One cannot blindly use 0.7 V as diode drop. Check the datasheet to see the minimum current specified on the charts.
$endgroup$
– Indraneel
2 hours ago
add a comment |
$begingroup$
Most diodes will be better than 1N4148. Diodes for higher current will usually have less voltage drop at lower current. As Andy says, Schottky diodes will have lowest voltage drop. At about 200 mA voltage drops for common diodes are (from various datasheets):
DIODE Vdrop @ 200 mA Diode type
1N4148 1.0 Signal
1N4007 0.8 General rectifier (1A)
1N5408 0.6 General rectifier (3A)
1N5817 0.25 Schottky (1A)
1N5820 0.2 Schottky (3A)
answered 8 hours ago
IndraneelIndraneel
1,3901715
$endgroup$
Most diodes will be better than 1N4148. Diodes for higher current will usually have less voltage drop at lower current. As Andy says, Schottky diodes will have lowest voltage drop. At about 200 mA voltage drops for common diodes are (from various datasheets):
DIODE Vdrop @ 200 mA Diode type
1N4148 1.0 Signal
1N4007 0.8 General rectifier (1A)
1N5408 0.6 General rectifier (3A)
1N5817 0.25 Schottky (1A)
1N5820 0.2 Schottky (3A)
answered 8 hours ago
IndraneelIndraneel
1,3901715
edited 8 hours ago
answered 8 hours ago
IndraneelIndraneel
1,3901715
answered 8 hours ago
IndraneelIndraneel
1,3901715
answered 8 hours ago
IndraneelIndraneel
1,3901715
1,3901715
$begingroup$
Recently I measure the 1N4148 on my circuit at anode and cathode, the avometer show 0.16v, would you like to explain to me about that?, i'm newbie in electrical, Thank you
$endgroup$
– Back Link
7 hours ago
$begingroup$
@BackLink en.wikipedia.org/wiki/Diode_modelling#Graphical_solution
$endgroup$
– Sean Houlihane
7 hours ago
$begingroup$
@SeanHoulihane understand this. On a Log I vs linear V diodes are a straight slope until bulk Rs takes over then on a Linear I vs V it is a straight slope . Aka stepwise approximation aka linear regression, so some Schottky diodes reach the same as silicon or more when higher than rated using pulsed currents.
$endgroup$
– Sunnyskyguy EE75
5 hours ago
1
$begingroup$
@BackLink What was the current flow through the diode? At negligible current flow, you can get very low voltage drop across the diode. This is why it is not always a good idea to power sleeping chips through diodes. If current draw reaches uA levels, the voltage supplied to the chip may exceed specifications. One cannot blindly use 0.7 V as diode drop. Check the datasheet to see the minimum current specified on the charts.
$endgroup$
– Indraneel
2 hours ago
add a comment |
$begingroup$
Recently I measure the 1N4148 on my circuit at anode and cathode, the avometer show 0.16v, would you like to explain to me about that?, i'm newbie in electrical, Thank you
$endgroup$
– Back Link
7 hours ago
$begingroup$
@BackLink en.wikipedia.org/wiki/Diode_modelling#Graphical_solution
$endgroup$
– Sean Houlihane
7 hours ago
$begingroup$
@SeanHoulihane understand this. On a Log I vs linear V diodes are a straight slope until bulk Rs takes over then on a Linear I vs V it is a straight slope . Aka stepwise approximation aka linear regression, so some Schottky diodes reach the same as silicon or more when higher than rated using pulsed currents.
$endgroup$
– Sunnyskyguy EE75
5 hours ago
1
$begingroup$
@BackLink What was the current flow through the diode? At negligible current flow, you can get very low voltage drop across the diode. This is why it is not always a good idea to power sleeping chips through diodes. If current draw reaches uA levels, the voltage supplied to the chip may exceed specifications. One cannot blindly use 0.7 V as diode drop. Check the datasheet to see the minimum current specified on the charts.
$endgroup$
– Indraneel
2 hours ago
$begingroup$
Recently I measure the 1N4148 on my circuit at anode and cathode, the avometer show 0.16v, would you like to explain to me about that?, i'm newbie in electrical, Thank you
$endgroup$
– Back Link
7 hours ago
$begingroup$
Recently I measure the 1N4148 on my circuit at anode and cathode, the avometer show 0.16v, would you like to explain to me about that?, i'm newbie in electrical, Thank you
$endgroup$
– Back Link
7 hours ago
$begingroup$
@BackLink en.wikipedia.org/wiki/Diode_modelling#Graphical_solution
$endgroup$
– Sean Houlihane
7 hours ago
$begingroup$
@BackLink en.wikipedia.org/wiki/Diode_modelling#Graphical_solution
$endgroup$
– Sean Houlihane
7 hours ago
$begingroup$
@SeanHoulihane understand this. On a Log I vs linear V diodes are a straight slope until bulk Rs takes over then on a Linear I vs V it is a straight slope . Aka stepwise approximation aka linear regression, so some Schottky diodes reach the same as silicon or more when higher than rated using pulsed currents.
$endgroup$
– Sunnyskyguy EE75
5 hours ago
$begingroup$
@SeanHoulihane understand this. On a Log I vs linear V diodes are a straight slope until bulk Rs takes over then on a Linear I vs V it is a straight slope . Aka stepwise approximation aka linear regression, so some Schottky diodes reach the same as silicon or more when higher than rated using pulsed currents.
$endgroup$
– Sunnyskyguy EE75
5 hours ago
1
1
$begingroup$
@BackLink What was the current flow through the diode? At negligible current flow, you can get very low voltage drop across the diode. This is why it is not always a good idea to power sleeping chips through diodes. If current draw reaches uA levels, the voltage supplied to the chip may exceed specifications. One cannot blindly use 0.7 V as diode drop. Check the datasheet to see the minimum current specified on the charts.
$endgroup$
– Indraneel
2 hours ago
$begingroup$
@BackLink What was the current flow through the diode? At negligible current flow, you can get very low voltage drop across the diode. This is why it is not always a good idea to power sleeping chips through diodes. If current draw reaches uA levels, the voltage supplied to the chip may exceed specifications. One cannot blindly use 0.7 V as diode drop. Check the datasheet to see the minimum current specified on the charts.
$endgroup$
– Indraneel
2 hours ago
add a comment |
$begingroup$
Firstly you should post a quick schematic of what you're working with. Schottky diodes are the kind with the lowest voltage drop. But your common models will still drop around 2mV.
There are ways to achieve the same result as using a diode, without the voltage drop. But it's more complicated and would depend on your design.
For solar energy harvesting though, you should be fine with a single Schottky between your panel and the rest of your design. Something like a 30V/3A would work with your average panel and have a pretty low voltage drop. Of course that all depends on what panel(s) you are using and what is connected to them...
answered 5 hours ago
heketehekete
526
$endgroup$
1
$begingroup$
"Schottky diodes ... common models will still drop around 2mV." - Did you mean 200mV?
$endgroup$
– marcelm
4 hours ago
add a comment |
$begingroup$
Firstly you should post a quick schematic of what you're working with. Schottky diodes are the kind with the lowest voltage drop. But your common models will still drop around 2mV.
There are ways to achieve the same result as using a diode, without the voltage drop. But it's more complicated and would depend on your design.
For solar energy harvesting though, you should be fine with a single Schottky between your panel and the rest of your design. Something like a 30V/3A would work with your average panel and have a pretty low voltage drop. Of course that all depends on what panel(s) you are using and what is connected to them...
answered 5 hours ago
heketehekete
526
$endgroup$
1
$begingroup$
"Schottky diodes ... common models will still drop around 2mV." - Did you mean 200mV?
$endgroup$
– marcelm
4 hours ago
add a comment |
$begingroup$
Firstly you should post a quick schematic of what you're working with. Schottky diodes are the kind with the lowest voltage drop. But your common models will still drop around 2mV.
There are ways to achieve the same result as using a diode, without the voltage drop. But it's more complicated and would depend on your design.
For solar energy harvesting though, you should be fine with a single Schottky between your panel and the rest of your design. Something like a 30V/3A would work with your average panel and have a pretty low voltage drop. Of course that all depends on what panel(s) you are using and what is connected to them...
answered 5 hours ago
heketehekete
526
$endgroup$
Firstly you should post a quick schematic of what you're working with. Schottky diodes are the kind with the lowest voltage drop. But your common models will still drop around 2mV.
There are ways to achieve the same result as using a diode, without the voltage drop. But it's more complicated and would depend on your design.
For solar energy harvesting though, you should be fine with a single Schottky between your panel and the rest of your design. Something like a 30V/3A would work with your average panel and have a pretty low voltage drop. Of course that all depends on what panel(s) you are using and what is connected to them...
answered 5 hours ago
heketehekete
526
answered 5 hours ago
heketehekete
526
answered 5 hours ago
heketehekete
526
answered 5 hours ago
heketehekete
526
526
1
$begingroup$
"Schottky diodes ... common models will still drop around 2mV." - Did you mean 200mV?
$endgroup$
– marcelm
4 hours ago
add a comment |
1
$begingroup$
"Schottky diodes ... common models will still drop around 2mV." - Did you mean 200mV?
$endgroup$
– marcelm
4 hours ago
1
1
$begingroup$
"Schottky diodes ... common models will still drop around 2mV." - Did you mean 200mV?
$endgroup$
– marcelm
4 hours ago
$begingroup$
"Schottky diodes ... common models will still drop around 2mV." - Did you mean 200mV?
$endgroup$
– marcelm
4 hours ago
add a comment |
$begingroup$
If you are just using the diodes to mux two power sources then you can use an ideal diode chip.
https://www.analog.com/en/parametricsearch/11029
They typically consume micro-amps of current. The forward voltage drop is usually only a few mV.
answered 4 hours ago
user4574user4574
3,657512
$endgroup$
add a comment |
$begingroup$
If you are just using the diodes to mux two power sources then you can use an ideal diode chip.
https://www.analog.com/en/parametricsearch/11029
They typically consume micro-amps of current. The forward voltage drop is usually only a few mV.
answered 4 hours ago
user4574user4574
3,657512
$endgroup$
add a comment |
$begingroup$
If you are just using the diodes to mux two power sources then you can use an ideal diode chip.
https://www.analog.com/en/parametricsearch/11029
They typically consume micro-amps of current. The forward voltage drop is usually only a few mV.
answered 4 hours ago
user4574user4574
3,657512
$endgroup$
If you are just using the diodes to mux two power sources then you can use an ideal diode chip.
https://www.analog.com/en/parametricsearch/11029
They typically consume micro-amps of current. The forward voltage drop is usually only a few mV.
answered 4 hours ago
user4574user4574
3,657512
answered 4 hours ago
user4574user4574
3,657512
answered 4 hours ago
user4574user4574
3,657512
answered 4 hours ago
user4574user4574
3,657512
3,657512
add a comment |
add a comment |
Back Link is a new contributor. Be nice, and check out our Code of Conduct.
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1
$begingroup$
If you study diodes, they don't have a threshold voltage as such but sometimes it's convenient to refer to a value between 0.5 volts and 1 volt. Try looking for schottky diodes as they have the lowest forward volt drop for a given current. Germanium diodes are also worth looking at but their availability and reliability is somewhat degraded.
$endgroup$
– Andy aka
8 hours ago
$begingroup$
Thanks for your answer, i used 1N4148 diode, may be any diode better than 1N4148
$endgroup$
– Back Link
8 hours ago
1
$begingroup$
How exactly do you intend to use them?
$endgroup$
– Lundin
8 hours ago
1
$begingroup$
In series with the supply? Then you definitely need a different diode. There's specialized fast diodes suitable for use together with regulators, for example. I would advise you to post a simple schematic on this site (there's a free schematic tool you can use) and ask for feedback about component choice.
$endgroup$
– Lundin
7 hours ago
1
$begingroup$
Possible duplicate of Lowest voltage drop diode possible
$endgroup$
– dim
4 hours ago