BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device of a rectifier, and more particularly, to a DC link voltage control device and a pulse width modulated rectifier of a rectifier using a load current observer for reducing the capacity of a DC link capacitor serving as a buffer between a power supply converter and a load side converter. It relates to a control device.;Load current observer regarded as unknown disturbance, voltage controller using load current observer, current controller for controlling output of voltage controller with predetermined current gain characteristics, voltage modulator for pulse width modulating and outputting current controller output, transformer modulation The power supply side estimates an unknown load current, including a power link unit switched according to a negative pulse width modulated gating signal, a power supply unit supplying power to the power link unit, a buffer unit for reducing power fluctuations on the load side, and an unknown load. By compensating in advance, the capacity of the capacitor, which acts as a buffer between the power-side converter and the load-side converter, can be greatly reduced.
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