Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [charger]

A device which controls the voltage and current being delivered to a capacitor or battery.

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How to determine the total number of charges a portable charger can supply for a phone?

According to can a 3000mAh portable charger charge a 1500mAh battery?, it was mentioned that a 3000mAh Portable charger can only charge a 1500mAh phone's battery 1.33334 times. So, how do we determine the total number of charges that a Portable…
Jack
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Is there a reason GaN chargers stop at 65W?

During the last year or so we have seen commercial release of USB chargers utilizing GaN technology. For some reason it seems no products go higher than 65W. The Navitas reference platform was 65W, Delta released a 65W under the Innergie brand --…
chx
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MCP73871 doesn't start to charge the battery

I use mcp73871 for charging LiPo battery. This is my schematic: Some settings: -charge current 100mA via R15 -charge stop current 10mA via R14 -Charge enable high -Timer enable set pull-up via R13(I'm not sure whether pull-up is OK for this) When…
Berker Işık
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Value of blown resistor in this simple lead acid charger, Please help if you can

I hope someone can help with this very simple circuit, I have traced from the pcb, my electronics theory has really gone out the window, The circuit shown is from a car battery charger and has a 2 transistor circuit to monitor the battery turning…
George
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DC output of phone charger

I have a nokia phone charger which has the following specifications: Input: AC 100-240 V, 50-60 Hz, 100 mA Output: DC 5.0 V, 350 mA When I checked the output of the charger with a multimeter it shows 7.7 V. Why is it so? Is it because the…
karthik
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humming of a mobile phone charger

Why do a mobile phone charger (without mobile phone attached to it) constantly hums when kept plugged into A.C. outlet and the moment mobile phone is plugged into charger, humming goes. Why so ?
user2888999
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The voltage VBAT on the HP4059 IC

I am using the HP4059 charger to charge a 35 mAh battery. Here is my schematic: I have placed a 3 kΩ resistor R1 (charging current of 33.3 mA). If there is no load on VBAT, everything works fine, and the VBAT voltage is 4.2 V. However, if I connect…
Максим Захаров
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can I use a 5v 1a charger with a 5v 2a device?

Possible Duplicate: Choosing power supply, how to get the voltage and current ratings? I have a new tablet with a charger that reads 5v 2a, can I charge the tablet with my phone charger, which reads 5v 1a? Thanks!
user17999
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Circuit for 3 stage lead acid battery charger controlled by microcontroller advice

I designed the circuit below as a mashup of different ideas. It is a lead acid battery charger controlled by a microcontroller. The relay allows the micro to select between the constant current circuit and the constant voltage circuit. The micro can…
aquamoon
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When a power supply has multiple stated output parameters, are those discrete output settings or some possible settings along a continuum?

Let's take my 30W USB-C Apple power supply as an example: https://www.apple.com/shop/product/MR2A2LL/A/30w-usb-c-power-adapter. Printed on it are 4 outputs: 20V / 1.5A 15V / 2A 9V / 3A 5V / 3A Are these fundamentally discrete charging profiles…
user2990590
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How does a ranged voltage battery charger work?

I'm wondering how a battery charger works that can take different voltages. For example Panasonic EY0L81 with voltage range frlm 10.8 - 28.8v, how does it identify which voltage to charge?. I also have a Bosch AL 1404 7.2 - 14.4v.
Genetgenet
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What does centertap transformer mean 26.4V 10A

I'm searching for a transformer for my battery charger unit EBL 264-3. Because the manufacturer SCHAUDT doesnt want to provide the informations regarding the elements in their units I have contacted a guy that repairs the units. He said that the…
Bob Bobovski
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When is a charge controller NOT necessary?

A pratical/theoretical question.. is a charge controller always necessary? Example: A ventilation fan needs to run when the sun is out. Can I directly connect a 12v solar panel to a 12v fan? Will it just run in proportion to sunlight? Will it burn…
Deader Dave
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How can I build a charger for this RC helicopter?

I have this remote controlled helicopter: http://www.clasohlson.com/se/Radiostyrd-helikopter/31-8071 Currently it is charged by connecting the remote control. However, since the RC runs on batteries, I am thinking it would be nice to charge the…
Sten
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Full Charge Indicator

Can someone explain or give an outline of how the indicators on chargers work? I have a charger for a device, which displays a red light when connected and not fully charged, but after it is charged it becomes green. I am guessing it has to be with…
Sherby
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