Elektronik / Güç Elektroniği/

USB Nimh Nicd Pil Şarj Devresi

Devre LM393 Op-amp üzerine kurulu bilgisayarın USB portundaki 5 volt ile 2 adet AA NiMH, NiCd pili şarj edebiliyor. Şarj akımı 470mA devreye ait pcb çizimi ve detaylı bilgi (ingilizce) var.

usb-charger-circuit-testing-pil-sarj-devresi

During charging, R1, R2, and R4 form a three-way voltage divider which yields about 1.26V at the non-inverting input of Z1a (pin 3, Vref). TR1 is a thermistor that is in direct contact with the cells being charged. It has a resistance of 10k at 25°C (77°F), which varies inversely with temperature by about 3.7% for every 1C° (1.8F°). R3 and TR1 form a voltage divider whose value is applied to the inverting input (pin 2, Vtmp). At a temperature of 20°C (68°F), TR1 is about 12k, which makes Vtmp about 1.76V.

The charger in this project is designed to charge two AA NiMH or NiCd cells of any capacity (as long as they are the same) at about 470mA. It will charge 700mAh NiCds in about 1.5 hours, 1500mAh NiMHs in about 3.5 hours, and 2500mAh NiMHs in about 5.5 hours. The charger incorporates an automatic charge cut-off circuit based on cell temperature, and the cells can be left in the charger indefinitely after cut-off.

usb-battery-charger-schematic usb-pil-sarj-devresi-baski-devre-pcb usb-charger-placement

Size: 3.8″L x 1.2″W x 0.7″H (9.7cm x 3.0cm x 1.5cm).
Cells: Two AA, NiMH or NiCd
Charging Current: 470mA
Charge Termination Method: Battery Temperature (33°C)
Trickle Current: 10mA
Power Source: Desktop, Laptop, or Hub USB port
Operating Conditions: 15°C to 25°C (59°F to 77°F)

Pil Akımı Şarj Süresi
700mAh NiCd 1.5saat
1100mAh NiCd 2.5saat
1600mAh NiMH 3.5saat
2000mAh NiMH 4.5saat
2500mAh NiMH 5.5saat

Kaynak: USB Powered AA NiMH and NiCd Battery Charger Alternatif link: USB Nimh Nicd Pil Şarj Devresi

Dosya indirme LINK listesi (TXT formatında) link-619.zip şifre-pass: 320volt.com

  1. serdar 2013/03/20

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