A SECURITY JACKET FOR WORKERS ON THE ROAD AT NIGHT

摘要

The present invention relates to a proportional current control circuit for driving a pump of a heavy construction equipment, and it is difficult to precisely control the load current by driving the sink system in the past, and in the event of a short circuit, In order to solve the problems that the equipment can not be moved to a safe place for finishing or repairing the work in progress, in the present invention, a manual pump control unit 30 for manual input, a proportional current circuit for supplying a required current A PI controller 40 for outputting a voltage Vreg by operating such that the current sensed with the required current is equal to the reference current generator 35, A third current sensor 70 connected to the switching element Q2 to sense the output current to increase current accuracy, and a third current sensor 70 connected between the switching element Q2 and the main power source, A short circuit protector 60 for preventing breakage due to an overcurrent during a short circuit and an error detector 75 for generating an error signal for an external operator to facilitate maintenance and repair work It can reduce the volume of the whole circuit, improve the performance of equipment, facilitate short-circuit protection, facilitate maintenance and repair work by generating error signal, and ensure operability and efficiency of equipment even during manual operation