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The product is intended for specialists and requires qualified and authorized personnel. The product does not include assembly/use instructions . Putting the product into operation by unqualified persons leads to the loss of the warranty according to the Terms and Conditions on the site.
The specified technical parameters (current, power, etc.) represent maximum allowable values under ideal operating conditions. For safe use and optimal lifespan, it is recommended to operate the product continuously at no more than 50% of the specified maximum values.
Lead-Acid Battery Charging Module, CN3768, AC-DC, 12V
Charging module for 12V lead-acid batteries with CN3768, ideal for UPS systems, security systems, and emergency lighting. It offers intelligent 3-stage CC CV float charging for longer service life, accepts 12-20V AC or 15-30V DC input, delivers up to 4A with over 90% efficiency, and includes overvoltage, overheating, and reverse polarity protection, with an LED for charging status.
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The charging module for 12V lead-acid batteries is based on the CN3768 integrated circuit, which implements a smart three-stage charging algorithm: constant current, constant voltage, and float (maintenance).
This approach ensures efficient and safe charging, extending the battery’s service life. The module can be powered either from an AC source (12-20V) or DC (15-30V), offering great flexibility for integration into various applications. The maximum charging current is 4A, with efficiency exceeding 90% thanks to the 315 kHz switching frequency.
Among the main features are: overvoltage, overheating, and reverse polarity protection, LED indicator for charging status (active or complete), over-charge voltage of 14.8V, and float voltage of 13.55V for maintaining the battery without overloading it.
The module is compatible with any control platform or system that requires a 12V power supply or battery backup. Thanks to its operating temperature range (-40 ~ 85°C) and compact dimensions of 32 x 44 mm, it is suitable for UPS applications, security systems, emergency lighting, and portable equipment.
Specifications:
Chip: CN3768
Input voltage: AC 12 - 20V / DC 15 - 30V
Maximum charging current: 4A
Over-charge voltage: 14.8V
Float voltage: 13.55V
Efficiency: > 90%
Switching frequency: 315 kHz
Protections: Overvoltage, overheating, reverse polarity
Status indicator: LED (active / full charge)
Operating temperature: -40 ~ 85°C
Dimensions: 32 x 44 mm
Layout:
Note: The AC input is separate from the DC input. Do not connect both AC and DC.
Usage:
Connect the 12V lead-acid battery to the BAT+ and BAT- terminals, strictly observing the polarity indicated on the module.
Never short-circuit the battery output.
Connect the power source, AC 12-20V (NOT 220VAC!) to the AC terminals (polarity does not matter) or DC 15-30V to the VI+ and VI- terminals, making sure the source can supply enough current for charging.
The module automatically starts the constant-current charging phase: the current is maintained at the set maximum value, and the battery voltage increases progressively.
When the voltage reaches 14.8V, the module automatically switches to constant-voltage mode: the voltage remains fixed at 14.8V, and the current gradually decreases as the battery charges.
When the current drops below the internal detection threshold, the module automatically switches to float mode: the voltage is maintained at 13.55V, compensating for self-discharge without overloading the battery.
The LED indicates the current status: lit during active charging, off or changing color when charging is complete (behavior depends on batch).
The module can remain connected to the battery long-term in float mode, without risk of overcharging.
Dimensions diagram:
Produs destinat utilizarii in proiecte electronice, automatizari, prototipare, educatie si cercetare.
Produsul trebuie utilizat numai conform specificatiilor tehnice mentionate in descriere si/sau in documentatia produsului.
Avertismente generale de siguranta:
Nu utilizati produsul la tensiuni, curenti sau temperaturi peste valorile specificate.
Montajul si conectarea trebuie realizate de persoane cu cunostinte tehnice minime in domeniul electric/electronic.
Evitati scurtcircuitele, inversarea polaritatii si conectarea gresita a alimentarii.
Nu lasati produsul alimentat nesupravegheat in timpul testelor.
Produsul nu este jucarie si nu este destinat copiilor.
Pentru modulele electronice, se recomanda utilizarea in carcase, panouri sau montaje protejate, dupa caz.
Identificare produs:
Denumirea produsului, codul/SKU-ul si caracteristicile tehnice sunt mentionate in pagina produsului si/sau pe eticheta ambalajului.
Producator / Importator / Distribuitor:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Website: www.sigmanortec.ro
Persoana responsabila in UE:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Documentatie si siguranta:
Pentru informatii suplimentare, fise tehnice, declaratii de conformitate sau instructiuni, ne puteti contacta la [email protected].
