KR970067410A - Coil drive device of electromagnetic contactor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving apparatus for an electromagnetic contactor, and relates to a coil driving apparatus for an electromagnetic contactor which prevents a burnout of an electromagnetic contactor and provides an overcurrent protection function by giving a wide range to a characteristic operating voltage. 1) When the electromagnetic contactor draws the suction current to the coil for a certain period of time regardless of the operating voltage when the electromagnetic contactor sucks it, the coil is heated or insulated due to energization of the overcurrent after the suction of the electromagnetic contactor is completed. 2) When the magnetic contactor keeps on, the overcurrent flows to the coil because it energizes the coil in proportion to the operating voltage. Therefore, it is burned out due to excessive heat or faults, and 3) In case of overvoltage, the attracting force is increased due to the overcurrent flowing in the coil at on / off Aga damaged thereby there is a problem of shortening the life of the contactor.

According to an aspect of the present invention, there is provided a plasma display apparatus comprising: an input unit for receiving a power supply; a filter unit for removing noise from a power source applied to the input unit; a rectifying unit for rectifying the noise- A voltage detection unit for receiving a voltage of the divided voltage unit to generate a constant voltage and generating a constant voltage, and outputting a detection signal when the voltage is equal to or higher than a predetermined value, the voltage being received by the output of the constant voltage unit; A constant length pulse generator for generating a pulse of a predetermined length inversely proportional to an input voltage when a signal is applied to the detector, and a controller for maintaining a high potential interval of the pulse inversely proportional to the input voltage when a signal is applied thereto, And an oscillation unit for outputting an oscillation frequency for maintaining a constant current without using the electromagnetic contactor, The amount of current induced in the coils is kept constant at the time of attraction by energizing the suction current in inverse proportion to the operation voltage, thereby preventing unnecessary current from flowing to the coil, 2) performing pulse width modulation oscillation in inverse proportion to the operation voltage, Since the coil is constantly energized with the constant current irrespective of the current, unnecessary overcurrent is prevented from being energized in the coil, and 3) constant attraction force is always generated irrespective of the operating voltage, thereby prolonging the life of the core.

Description

Coil drive device of electromagnetic contactor

Since this is a trivial issue, I did not include the contents of the text.

FIG. 5 is a diagram showing an apparatus for driving a coil of a magnetic contactor according to the present invention, FIG. 6 is an output waveform diagram of each part of FIG. 5, and FIG. 7 is a diagram showing a comparator terminal voltage of a constant- FIG. 8 is a diagram showing a voltage charged and discharged in a capacitor according to the magnitude of the output of the fifth-degree voltage detector and an output voltage of the comparator.

Claims (1)

A filter unit 210 for removing a noise of a power source popular in the input unit 200, a rectifying unit 220 for rectifying the noise-eliminated power source, a rectifying unit 220 A constant voltage unit 240 for generating a constant voltage by receiving the voltage of the voltage divider 230 and a constant voltage unit 240 for generating a constant voltage by applying a voltage of the voltage divider 230 to the constant voltage unit 240 A voltage detector 250 for receiving the output of the voltage detector 250 and outputting a detection signal to the voltage detector 250 when the voltage is equal to or greater than a predetermined value; A pulse generator 260 for generating an oscillation frequency for maintaining a constant current regardless of an input voltage while keeping a high potential interval of a pulse inversely proportional to an input voltage when a signal is applied from the voltage detector 250, (27) And the coil is driven by the coil. ※ Note: It is disclosed by the contents of the first application.