DEVICE FOR IGNITION OF ELECTRIC DETONATORS Russian patent published in 2002 - IPC

FIELD: spheres of economy where energy of blast is employed. SUBSTANCE: technical result of invention lies in formation of stable ignition current in presence of substantial variations of ohmic resistance of ignition circuit. Specified result is achieved by self- controlled automatic shunting of limiting resistor in ignition circuit. Device for ignition of electric detonators has two input leads for connection of source of constant voltage and two output leads for connection of electric detonator, make switch and limiting resistor. In addition device includes former of controlling voltage connected to input leads which output is connected to first input of differential converter and output of differential converter is connected to base of transistor, other leads of it are connected to limiting resistor. First lead of limiting resistor is connected through resistor of condition to first output lead and through starting switch to second output lead, second lead of limiting resistor is connected to second input of differential converter and through feedback resistor to first input lead and second input lead is coupled to first output lead. EFFECT: formation of stable ignition current in presence of substantial variations of ohmic resistance in ignition circuit. 2 dwg