DUAL PWM DIGITAL EXCITATION SYSTEM OF REGENERATION TYPE

摘要

A digital excitation system of a regeneration type dual PWM(Pulse Width Modulation) mode is provided to improve a speed of a control by controlling a field current through an IGBT(Insulated Gate Bipolar Transistor). An input power source part(110) drops a terminal voltage of a generator, and supplies an excitation voltage. An input power source switch(112) is installed in an output terminal of the input power source part. A rectifying capacitor(120) is parallel connected to the input power source part by the input power source switch. A power conversion part(130) converts the excitation voltage of the input power source part into a field voltage by a PWM mode. A field blocking part(140) blocks a current in an abnormal operation of the power conversion part. A DC power supply part(150) selectively supplies a DC power source to the power conversion part. A field winding(160) is connected to the field blocking part. A main control part(170) controls the input power source switch, a DC power source switch(152), and the power conversion part.