Tag: Battery Charger

While traveling, charging of the mobile phone, cellphone battery is a big problem as power supply source is not generally accessible. Battery will go flat within five to six hours if you keep your cellphone switched on continuously, making the cellphone useless. When your distance from the nearest relay station increases, a fully charged battery becomes necessary. Below is simple […]

This is a Very Simple circuit for Lead Acid Battery Charger using PB137 Regulator. The PB137 is used for lead acid battery charger circuit because it can give 1.5A at Vo=13.7V. The PB137 also has a reverse leakage current. The maximum reverse leakage current of PB137 is 10µA at Tj=0 to 40°C and V1=floating and Vo=13.7V. Here is the circuit […]

Powering the system is required by many applications while charging the battery simultaneously. Interaction between the system and charger may result in a false charge stoppage caused by the safety timer when the system is directly connected to the battery-charge output. The circuit diagram below shows a typical application circuit that removes such issues. This circuit has two independent power […]

This is a programmable current and voltage regulator circuit. It consist of a voltage regulator with external current limitation. The variable resistor R2 is forced by a constant current because of the fixed voltage of 2.77 V at the terminals of R1. The voltage at pin 2 and the output voltage are varied, if R2 is varied. Here is the […]