Universal LiIon, NiCd, NiMH battery charger based on MAX1501 chip. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells

 Comments on the article

Hi all. I have a philosophical thought. Humanity will die out after all. Moreover, it will die out not because it immediately pollutes its entire habitat, but because of laziness. Yes, yes - exactly from her. Moreover, the most paradoxical thing is that laziness is the engine of progress, but at the same time, this very progress generates even greater laziness in a person. Why am I saying all this? Well, it was inspired by another achievement of overseas microelectronics. Judge for yourself - there is one microcircuit with 16 pins. Using it, one resistor, two LEDs and two capacitors, a universal charger is made for all types of batteries. That is, for LiIon/NiCd/NiMH.

Yes, look at the diagram for yourself:

So how can you live in harmony with yourself? It is clear that as a radio amateur, I must completely independently develop a terrible charger circuit, which will contain about a dozen transistors, and then proudly present it to the public. But how can one ignore such absolute simplicity? Okay, lyrics aside, let's look at the diagram. Let's start with the main parameters of the MAX1501 chip:

It should also be noted that if a LiIon battery is charged in splendid isolation, then three NiCd or NiMH batteries are connected at once. Well, then, a few features that cannot leave anyone indifferent: there is no need for a heatsink on the microcircuit, despite the considerable current; adjustable maximum charge current; temperature control and charge shutdown at a certain temperature; programmable timer for maximum charge time; automatic recharging when the connected battery is discharged; Limiting the charging current when the device is turned on. This is the list. Now about the charging procedure itself - it happens like this. After turning on, the microcircuit begins to charge the battery with a low current - 10% of the maximum charging current set by resistor R1.

When the battery voltage reaches 2,8 volts, it receives a hefty kick in the form of the full value of the charging current, that is, the fast charge mode is activated. Well, when the voltage reaches 4,5 or 4,1 volts, depending on the type of battery, the charging current begins to decrease, and after it decreases by 30% of the nominal value, the HL1 LED lights up, which means the end of the charge. The HL2 LED lights up during the entire charge cycle. I won’t even provide a plate with the components - well, there’s absolutely no need.

Just a couple of notes:

1. Capacitors C1 and C2 are ceramic.
2. Resistor R1, which determines the charging current, is calculated by the formula: R=1000*(1.4/I), where I is the required charging current of the battery.

Publication: radiokot.ru

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