BATTERY-FED EXPLOSIONPROOF HEAD LAMP (VERSIONS) Russian patent published in 2006 - IPC F21L4/00 

FIELD: electric engineering; mine lamps.

SUBSTANCE: invention relates to portable lamps with built-in storage batteries, particularly, to explosionproof head lamps for use in mines. Proposed lamp has storage battery, light, electronic device connected to light and charging contacts connected to storage battery. Electronic device has electronic switch and electronic switch control circuit. One of charging contacts is connected to output of electronic switch. Lamp is furnished with timer connected to control circuit, circuit to determine presence of charging voltage across electronic switch output and circuit to measure voltage drop across electronic switch in process of battery charging whose inputs are connected to output of electronic switch, and outputs, to input of control circuit.

EFFECT: provision of control of battery charging according to chosen algorithm, increased service life of storage batteries.

4 cl, 2 dwg