Using 5 V adapter to power 12 V cordless phone
I am trying to power a 12 V 8 W cordless phone using a 5 V 1 A wall adapter.
I am using a step up DC/DC boost converter MT3608 for boosting output from 5 V to 12 V.
Theoretically it works - when I connect adapter to boost convertor input and setting potentiometer to 12 V by measuring output through multimeter - it shows 12 V.
But as soon as I connect the cordless the voltage drops to 2-3 V and cordless does not power on. So its not working on load.
I also have a 7.4 V li-ion cells which powers on the cordless fine - using the boost convertor.
My question is the DC coming from adapter different than DC coming from battery?
Also I noticed that the adapter indicator light is constant when charging a basic (non smartphone) phone battery but it pulsates when connected to step up convertor and cordless powered on. This made me more confused.
Please help me understand this behavior of adapter and what's wrong in what I am trying to do?
batteries boost
edited 4 hours ago
Jakub Rakus
2,10131121
asked 4 hours ago
Raool
111
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Raool is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I am trying to power a 12 V 8 W cordless phone using a 5 V 1 A wall adapter.
I am using a step up DC/DC boost converter MT3608 for boosting output from 5 V to 12 V.
Theoretically it works - when I connect adapter to boost convertor input and setting potentiometer to 12 V by measuring output through multimeter - it shows 12 V.
But as soon as I connect the cordless the voltage drops to 2-3 V and cordless does not power on. So its not working on load.
I also have a 7.4 V li-ion cells which powers on the cordless fine - using the boost convertor.
My question is the DC coming from adapter different than DC coming from battery?
Also I noticed that the adapter indicator light is constant when charging a basic (non smartphone) phone battery but it pulsates when connected to step up convertor and cordless powered on. This made me more confused.
Please help me understand this behavior of adapter and what's wrong in what I am trying to do?
batteries boost
edited 4 hours ago
Jakub Rakus
2,10131121
asked 4 hours ago
Raool
111
New contributor
Raool is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
3
I don't think $5 V × 1 A> 8 W$.
– Harry Svensson
4 hours ago
1
A 5V 1A wall adapter cannot provide the 8 W that the phone requires, regardless of any boost converter that you are using. As a result, the adapter is limiting its output current and the voltage sags through. Please try a 2 A or higher adapter instead.
– Andrey Akhmetov
4 hours ago
2
Just get a 12V 1A wall wart. Readily available. Cheap. Problem solved. The only wrinkle may be matching the connector plug.
– Phil Freedenberg
4 hours ago
add a comment |
I am trying to power a 12 V 8 W cordless phone using a 5 V 1 A wall adapter.
I am using a step up DC/DC boost converter MT3608 for boosting output from 5 V to 12 V.
Theoretically it works - when I connect adapter to boost convertor input and setting potentiometer to 12 V by measuring output through multimeter - it shows 12 V.
But as soon as I connect the cordless the voltage drops to 2-3 V and cordless does not power on. So its not working on load.
I also have a 7.4 V li-ion cells which powers on the cordless fine - using the boost convertor.
My question is the DC coming from adapter different than DC coming from battery?
Also I noticed that the adapter indicator light is constant when charging a basic (non smartphone) phone battery but it pulsates when connected to step up convertor and cordless powered on. This made me more confused.
Please help me understand this behavior of adapter and what's wrong in what I am trying to do?
batteries boost
edited 4 hours ago
Jakub Rakus
2,10131121
asked 4 hours ago
Raool
111
New contributor
Raool is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I am trying to power a 12 V 8 W cordless phone using a 5 V 1 A wall adapter.
I am using a step up DC/DC boost converter MT3608 for boosting output from 5 V to 12 V.
Theoretically it works - when I connect adapter to boost convertor input and setting potentiometer to 12 V by measuring output through multimeter - it shows 12 V.
But as soon as I connect the cordless the voltage drops to 2-3 V and cordless does not power on. So its not working on load.
I also have a 7.4 V li-ion cells which powers on the cordless fine - using the boost convertor.
My question is the DC coming from adapter different than DC coming from battery?
Also I noticed that the adapter indicator light is constant when charging a basic (non smartphone) phone battery but it pulsates when connected to step up convertor and cordless powered on. This made me more confused.
Please help me understand this behavior of adapter and what's wrong in what I am trying to do?
batteries boost
batteries boost
edited 4 hours ago
Jakub Rakus
2,10131121
asked 4 hours ago
Raool
111
New contributor
Raool is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 4 hours ago
Jakub Rakus
2,10131121
asked 4 hours ago
Raool
111
New contributor
Raool is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 4 hours ago
Jakub Rakus
2,10131121
edited 4 hours ago
Jakub Rakus
2,10131121
edited 4 hours ago
Jakub Rakus
2,10131121
2,10131121
asked 4 hours ago
Raool
111
New contributor
Raool is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
Raool
111
asked 4 hours ago
Raool
111
111
New contributor
Raool is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Raool is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Raool is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
3
I don't think $5 V × 1 A> 8 W$.
– Harry Svensson
4 hours ago
1
A 5V 1A wall adapter cannot provide the 8 W that the phone requires, regardless of any boost converter that you are using. As a result, the adapter is limiting its output current and the voltage sags through. Please try a 2 A or higher adapter instead.
– Andrey Akhmetov
4 hours ago
2
Just get a 12V 1A wall wart. Readily available. Cheap. Problem solved. The only wrinkle may be matching the connector plug.
– Phil Freedenberg
4 hours ago
add a comment |
3
I don't think $5 V × 1 A> 8 W$.
– Harry Svensson
4 hours ago
1
A 5V 1A wall adapter cannot provide the 8 W that the phone requires, regardless of any boost converter that you are using. As a result, the adapter is limiting its output current and the voltage sags through. Please try a 2 A or higher adapter instead.
– Andrey Akhmetov
4 hours ago
2
Just get a 12V 1A wall wart. Readily available. Cheap. Problem solved. The only wrinkle may be matching the connector plug.
– Phil Freedenberg
4 hours ago
3
3
I don't think $5 V × 1 A> 8 W$.
– Harry Svensson
4 hours ago
I don't think $5 V × 1 A> 8 W$.
– Harry Svensson
4 hours ago
1
1
A 5V 1A wall adapter cannot provide the 8 W that the phone requires, regardless of any boost converter that you are using. As a result, the adapter is limiting its output current and the voltage sags through. Please try a 2 A or higher adapter instead.
– Andrey Akhmetov
4 hours ago
A 5V 1A wall adapter cannot provide the 8 W that the phone requires, regardless of any boost converter that you are using. As a result, the adapter is limiting its output current and the voltage sags through. Please try a 2 A or higher adapter instead.
– Andrey Akhmetov
4 hours ago
2
2
Just get a 12V 1A wall wart. Readily available. Cheap. Problem solved. The only wrinkle may be matching the connector plug.
– Phil Freedenberg
4 hours ago
Just get a 12V 1A wall wart. Readily available. Cheap. Problem solved. The only wrinkle may be matching the connector plug.
– Phil Freedenberg
4 hours ago
add a comment |
2 Answers
2
active
oldest
votes
Theoretically it works -
No it doesn't. In theory 5 V x 1 A = 5 W maximum from your PSU. Your phone needs 8 W and you'll lose another 1 or 2 W in the voltage booster. It doesn't work in theory and, as you've found, it doesn't work in practice.
... when I connect adapter to boost convertor input and setting potentiometer to 12 V by measuring output through multimeter - it shows 12 V.
That's the open-circuit or unloaded voltage.
My question is the DC coming from adapter different than DC coming from battery?
Yes. The battery has a much higher current limit.
Also I noticed that the adapter indicator light is constant when charging a basic (non smartphone) phone battery but it pulsates when connected to step up convertor and cordless powered on. This made me more confused.
Why the confusion? Check the manual for the adaptor and you'll probably find that it's indicating over-current fault.
answered 3 hours ago
Transistor
79.9k778172
Hi, Thanks so much for clarifying it. It now makes complete sense to me. Also, can i ask whether this arrangement- (5v 1a adaptor and a dc booster)- can be used to charge a 6v 4.5ah lead acid battery- if i increase voltage to 7v for charging battery -- (Its printed- 7v for cyclic use on battery)
– Raool
2 hours ago
It possibly could but you need to ensure that it doesn't get overcharged. Read up on lead-acid battery charging to gain more understanding first.
– Transistor
1 hour ago
add a comment |
1. Theoretically it works:
Theoretically it is not correct, the power of adapter is not equal to the load power.
2.when I connect adapter to boost convertor input and setting potentiometer to 12 V by measuring output through multimeter
No load condition.
3. But as soon as I connect the cordless the voltage drops to 2-3 V and cordless does not power on. So its not working on load.
Obviously it will not, since the adapter is unable to provide the power required by the load.
4. I also have a 7.4 V li-ion cells which powers on the cordless fine - using the boost convertor.
The battery what you are using is having an high current delivery. that is required by the load.
5.Also I noticed that the adapter indicator light is constant when charging a basic (non smartphone) phone battery but it pulsates when connected to step up convertor and cordless powered on. This made me more confused.
Yeh, most of the Boost converters works on PWM technique.. which is going to use a switch and an inductor and capacitive network to change and discharge continuously to boost voltage... in this case the converter is going to draw current from the adapter in pulses (non-continuous).
Try the following...
Go with an readily available 12V, 1A adapter
or
Try an higher current rated adapter at 5V like 5V, 2A ... which is 10 Watts... since no boost converters are 100% efficient.
answered 2 hours ago
Satish Singupuram
4989
Hi, Thanks so much for clarifying it. It now makes complete sense to me. I just have a doubt-- the pwm technique iis it harmful for adapter - i mean will it short circuit, or are the adaters designed for such behaviour. Also, can i ask whether this arrangement- (5v 1a adaptor and a dc booster)- can be used to charge a 6v 4.5ah lead acid battery- if i increase voltage to 7v for charging battery -- (Its printed- 7v for cyclic use on battery)
– Raool
1 hour ago
Yeh you can ... need to design an auto cut-off circuit. and the charge current should be less than 20% of AH. so in your case < 1A
– Satish Singupuram
27 mins ago
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Theoretically it works -
No it doesn't. In theory 5 V x 1 A = 5 W maximum from your PSU. Your phone needs 8 W and you'll lose another 1 or 2 W in the voltage booster. It doesn't work in theory and, as you've found, it doesn't work in practice.
... when I connect adapter to boost convertor input and setting potentiometer to 12 V by measuring output through multimeter - it shows 12 V.
That's the open-circuit or unloaded voltage.
My question is the DC coming from adapter different than DC coming from battery?
Yes. The battery has a much higher current limit.
Also I noticed that the adapter indicator light is constant when charging a basic (non smartphone) phone battery but it pulsates when connected to step up convertor and cordless powered on. This made me more confused.
Why the confusion? Check the manual for the adaptor and you'll probably find that it's indicating over-current fault.
answered 3 hours ago
Transistor
79.9k778172
Hi, Thanks so much for clarifying it. It now makes complete sense to me. Also, can i ask whether this arrangement- (5v 1a adaptor and a dc booster)- can be used to charge a 6v 4.5ah lead acid battery- if i increase voltage to 7v for charging battery -- (Its printed- 7v for cyclic use on battery)
– Raool
2 hours ago
It possibly could but you need to ensure that it doesn't get overcharged. Read up on lead-acid battery charging to gain more understanding first.
– Transistor
1 hour ago
add a comment |
Theoretically it works -
No it doesn't. In theory 5 V x 1 A = 5 W maximum from your PSU. Your phone needs 8 W and you'll lose another 1 or 2 W in the voltage booster. It doesn't work in theory and, as you've found, it doesn't work in practice.
... when I connect adapter to boost convertor input and setting potentiometer to 12 V by measuring output through multimeter - it shows 12 V.
That's the open-circuit or unloaded voltage.
My question is the DC coming from adapter different than DC coming from battery?
Yes. The battery has a much higher current limit.
Also I noticed that the adapter indicator light is constant when charging a basic (non smartphone) phone battery but it pulsates when connected to step up convertor and cordless powered on. This made me more confused.
Why the confusion? Check the manual for the adaptor and you'll probably find that it's indicating over-current fault.
answered 3 hours ago
Transistor
79.9k778172
Hi, Thanks so much for clarifying it. It now makes complete sense to me. Also, can i ask whether this arrangement- (5v 1a adaptor and a dc booster)- can be used to charge a 6v 4.5ah lead acid battery- if i increase voltage to 7v for charging battery -- (Its printed- 7v for cyclic use on battery)
– Raool
2 hours ago
It possibly could but you need to ensure that it doesn't get overcharged. Read up on lead-acid battery charging to gain more understanding first.
– Transistor
1 hour ago
add a comment |
Theoretically it works -
No it doesn't. In theory 5 V x 1 A = 5 W maximum from your PSU. Your phone needs 8 W and you'll lose another 1 or 2 W in the voltage booster. It doesn't work in theory and, as you've found, it doesn't work in practice.
... when I connect adapter to boost convertor input and setting potentiometer to 12 V by measuring output through multimeter - it shows 12 V.
That's the open-circuit or unloaded voltage.
My question is the DC coming from adapter different than DC coming from battery?
Yes. The battery has a much higher current limit.
Also I noticed that the adapter indicator light is constant when charging a basic (non smartphone) phone battery but it pulsates when connected to step up convertor and cordless powered on. This made me more confused.
Why the confusion? Check the manual for the adaptor and you'll probably find that it's indicating over-current fault.
answered 3 hours ago
Transistor
79.9k778172
Theoretically it works -
No it doesn't. In theory 5 V x 1 A = 5 W maximum from your PSU. Your phone needs 8 W and you'll lose another 1 or 2 W in the voltage booster. It doesn't work in theory and, as you've found, it doesn't work in practice.
... when I connect adapter to boost convertor input and setting potentiometer to 12 V by measuring output through multimeter - it shows 12 V.
That's the open-circuit or unloaded voltage.
My question is the DC coming from adapter different than DC coming from battery?
Yes. The battery has a much higher current limit.
Also I noticed that the adapter indicator light is constant when charging a basic (non smartphone) phone battery but it pulsates when connected to step up convertor and cordless powered on. This made me more confused.
Why the confusion? Check the manual for the adaptor and you'll probably find that it's indicating over-current fault.
answered 3 hours ago
Transistor
79.9k778172
answered 3 hours ago
Transistor
79.9k778172
answered 3 hours ago
Transistor
79.9k778172
answered 3 hours ago
Transistor
79.9k778172
79.9k778172
Hi, Thanks so much for clarifying it. It now makes complete sense to me. Also, can i ask whether this arrangement- (5v 1a adaptor and a dc booster)- can be used to charge a 6v 4.5ah lead acid battery- if i increase voltage to 7v for charging battery -- (Its printed- 7v for cyclic use on battery)
– Raool
2 hours ago
It possibly could but you need to ensure that it doesn't get overcharged. Read up on lead-acid battery charging to gain more understanding first.
– Transistor
1 hour ago
add a comment |
Hi, Thanks so much for clarifying it. It now makes complete sense to me. Also, can i ask whether this arrangement- (5v 1a adaptor and a dc booster)- can be used to charge a 6v 4.5ah lead acid battery- if i increase voltage to 7v for charging battery -- (Its printed- 7v for cyclic use on battery)
– Raool
2 hours ago
It possibly could but you need to ensure that it doesn't get overcharged. Read up on lead-acid battery charging to gain more understanding first.
– Transistor
1 hour ago
Hi, Thanks so much for clarifying it. It now makes complete sense to me. Also, can i ask whether this arrangement- (5v 1a adaptor and a dc booster)- can be used to charge a 6v 4.5ah lead acid battery- if i increase voltage to 7v for charging battery -- (Its printed- 7v for cyclic use on battery)
– Raool
2 hours ago
Hi, Thanks so much for clarifying it. It now makes complete sense to me. Also, can i ask whether this arrangement- (5v 1a adaptor and a dc booster)- can be used to charge a 6v 4.5ah lead acid battery- if i increase voltage to 7v for charging battery -- (Its printed- 7v for cyclic use on battery)
– Raool
2 hours ago
It possibly could but you need to ensure that it doesn't get overcharged. Read up on lead-acid battery charging to gain more understanding first.
– Transistor
1 hour ago
It possibly could but you need to ensure that it doesn't get overcharged. Read up on lead-acid battery charging to gain more understanding first.
– Transistor
1 hour ago
add a comment |
1. Theoretically it works:
Theoretically it is not correct, the power of adapter is not equal to the load power.
2.when I connect adapter to boost convertor input and setting potentiometer to 12 V by measuring output through multimeter
No load condition.
3. But as soon as I connect the cordless the voltage drops to 2-3 V and cordless does not power on. So its not working on load.
Obviously it will not, since the adapter is unable to provide the power required by the load.
4. I also have a 7.4 V li-ion cells which powers on the cordless fine - using the boost convertor.
The battery what you are using is having an high current delivery. that is required by the load.
5.Also I noticed that the adapter indicator light is constant when charging a basic (non smartphone) phone battery but it pulsates when connected to step up convertor and cordless powered on. This made me more confused.
Yeh, most of the Boost converters works on PWM technique.. which is going to use a switch and an inductor and capacitive network to change and discharge continuously to boost voltage... in this case the converter is going to draw current from the adapter in pulses (non-continuous).
Try the following...
Go with an readily available 12V, 1A adapter
or
Try an higher current rated adapter at 5V like 5V, 2A ... which is 10 Watts... since no boost converters are 100% efficient.
answered 2 hours ago
Satish Singupuram
4989
Hi, Thanks so much for clarifying it. It now makes complete sense to me. I just have a doubt-- the pwm technique iis it harmful for adapter - i mean will it short circuit, or are the adaters designed for such behaviour. Also, can i ask whether this arrangement- (5v 1a adaptor and a dc booster)- can be used to charge a 6v 4.5ah lead acid battery- if i increase voltage to 7v for charging battery -- (Its printed- 7v for cyclic use on battery)
– Raool
1 hour ago
Yeh you can ... need to design an auto cut-off circuit. and the charge current should be less than 20% of AH. so in your case < 1A
– Satish Singupuram
27 mins ago
add a comment |
1. Theoretically it works:
Theoretically it is not correct, the power of adapter is not equal to the load power.
2.when I connect adapter to boost convertor input and setting potentiometer to 12 V by measuring output through multimeter
No load condition.
3. But as soon as I connect the cordless the voltage drops to 2-3 V and cordless does not power on. So its not working on load.
Obviously it will not, since the adapter is unable to provide the power required by the load.
4. I also have a 7.4 V li-ion cells which powers on the cordless fine - using the boost convertor.
The battery what you are using is having an high current delivery. that is required by the load.
5.Also I noticed that the adapter indicator light is constant when charging a basic (non smartphone) phone battery but it pulsates when connected to step up convertor and cordless powered on. This made me more confused.
Yeh, most of the Boost converters works on PWM technique.. which is going to use a switch and an inductor and capacitive network to change and discharge continuously to boost voltage... in this case the converter is going to draw current from the adapter in pulses (non-continuous).
Try the following...
Go with an readily available 12V, 1A adapter
or
Try an higher current rated adapter at 5V like 5V, 2A ... which is 10 Watts... since no boost converters are 100% efficient.
answered 2 hours ago
Satish Singupuram
4989
Hi, Thanks so much for clarifying it. It now makes complete sense to me. I just have a doubt-- the pwm technique iis it harmful for adapter - i mean will it short circuit, or are the adaters designed for such behaviour. Also, can i ask whether this arrangement- (5v 1a adaptor and a dc booster)- can be used to charge a 6v 4.5ah lead acid battery- if i increase voltage to 7v for charging battery -- (Its printed- 7v for cyclic use on battery)
– Raool
1 hour ago
Yeh you can ... need to design an auto cut-off circuit. and the charge current should be less than 20% of AH. so in your case < 1A
– Satish Singupuram
27 mins ago
add a comment |
1. Theoretically it works:
Theoretically it is not correct, the power of adapter is not equal to the load power.
2.when I connect adapter to boost convertor input and setting potentiometer to 12 V by measuring output through multimeter
No load condition.
3. But as soon as I connect the cordless the voltage drops to 2-3 V and cordless does not power on. So its not working on load.
Obviously it will not, since the adapter is unable to provide the power required by the load.
4. I also have a 7.4 V li-ion cells which powers on the cordless fine - using the boost convertor.
The battery what you are using is having an high current delivery. that is required by the load.
5.Also I noticed that the adapter indicator light is constant when charging a basic (non smartphone) phone battery but it pulsates when connected to step up convertor and cordless powered on. This made me more confused.
Yeh, most of the Boost converters works on PWM technique.. which is going to use a switch and an inductor and capacitive network to change and discharge continuously to boost voltage... in this case the converter is going to draw current from the adapter in pulses (non-continuous).
Try the following...
Go with an readily available 12V, 1A adapter
or
Try an higher current rated adapter at 5V like 5V, 2A ... which is 10 Watts... since no boost converters are 100% efficient.
answered 2 hours ago
Satish Singupuram
4989
1. Theoretically it works:
Theoretically it is not correct, the power of adapter is not equal to the load power.
2.when I connect adapter to boost convertor input and setting potentiometer to 12 V by measuring output through multimeter
No load condition.
3. But as soon as I connect the cordless the voltage drops to 2-3 V and cordless does not power on. So its not working on load.
Obviously it will not, since the adapter is unable to provide the power required by the load.
4. I also have a 7.4 V li-ion cells which powers on the cordless fine - using the boost convertor.
The battery what you are using is having an high current delivery. that is required by the load.
5.Also I noticed that the adapter indicator light is constant when charging a basic (non smartphone) phone battery but it pulsates when connected to step up convertor and cordless powered on. This made me more confused.
Yeh, most of the Boost converters works on PWM technique.. which is going to use a switch and an inductor and capacitive network to change and discharge continuously to boost voltage... in this case the converter is going to draw current from the adapter in pulses (non-continuous).
Try the following...
Go with an readily available 12V, 1A adapter
or
Try an higher current rated adapter at 5V like 5V, 2A ... which is 10 Watts... since no boost converters are 100% efficient.
answered 2 hours ago
Satish Singupuram
4989
answered 2 hours ago
Satish Singupuram
4989
answered 2 hours ago
Satish Singupuram
4989
answered 2 hours ago
Satish Singupuram
4989
4989
Hi, Thanks so much for clarifying it. It now makes complete sense to me. I just have a doubt-- the pwm technique iis it harmful for adapter - i mean will it short circuit, or are the adaters designed for such behaviour. Also, can i ask whether this arrangement- (5v 1a adaptor and a dc booster)- can be used to charge a 6v 4.5ah lead acid battery- if i increase voltage to 7v for charging battery -- (Its printed- 7v for cyclic use on battery)
– Raool
1 hour ago
Yeh you can ... need to design an auto cut-off circuit. and the charge current should be less than 20% of AH. so in your case < 1A
– Satish Singupuram
27 mins ago
add a comment |
Hi, Thanks so much for clarifying it. It now makes complete sense to me. I just have a doubt-- the pwm technique iis it harmful for adapter - i mean will it short circuit, or are the adaters designed for such behaviour. Also, can i ask whether this arrangement- (5v 1a adaptor and a dc booster)- can be used to charge a 6v 4.5ah lead acid battery- if i increase voltage to 7v for charging battery -- (Its printed- 7v for cyclic use on battery)
– Raool
1 hour ago
Yeh you can ... need to design an auto cut-off circuit. and the charge current should be less than 20% of AH. so in your case < 1A
– Satish Singupuram
27 mins ago
Hi, Thanks so much for clarifying it. It now makes complete sense to me. I just have a doubt-- the pwm technique iis it harmful for adapter - i mean will it short circuit, or are the adaters designed for such behaviour. Also, can i ask whether this arrangement- (5v 1a adaptor and a dc booster)- can be used to charge a 6v 4.5ah lead acid battery- if i increase voltage to 7v for charging battery -- (Its printed- 7v for cyclic use on battery)
– Raool
1 hour ago
Hi, Thanks so much for clarifying it. It now makes complete sense to me. I just have a doubt-- the pwm technique iis it harmful for adapter - i mean will it short circuit, or are the adaters designed for such behaviour. Also, can i ask whether this arrangement- (5v 1a adaptor and a dc booster)- can be used to charge a 6v 4.5ah lead acid battery- if i increase voltage to 7v for charging battery -- (Its printed- 7v for cyclic use on battery)
– Raool
1 hour ago
Yeh you can ... need to design an auto cut-off circuit. and the charge current should be less than 20% of AH. so in your case < 1A
– Satish Singupuram
27 mins ago
Yeh you can ... need to design an auto cut-off circuit. and the charge current should be less than 20% of AH. so in your case < 1A
– Satish Singupuram
27 mins ago
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Raool is a new contributor. Be nice, and check out our Code of Conduct.
Raool is a new contributor. Be nice, and check out our Code of Conduct.
Raool is a new contributor. Be nice, and check out our Code of Conduct.
Raool is a new contributor. Be nice, and check out our Code of Conduct.
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3
I don't think $5 V × 1 A> 8 W$.
– Harry Svensson
4 hours ago
1
A 5V 1A wall adapter cannot provide the 8 W that the phone requires, regardless of any boost converter that you are using. As a result, the adapter is limiting its output current and the voltage sags through. Please try a 2 A or higher adapter instead.
– Andrey Akhmetov
4 hours ago
2
Just get a 12V 1A wall wart. Readily available. Cheap. Problem solved. The only wrinkle may be matching the connector plug.
– Phil Freedenberg
4 hours ago