Robust digital control of DC-DC converter at remote sensing

If the lines which connect the output terminal of DC-DC converter and the load are long, the voltage actually across load will be changed largely to produce the voltage drops by the impedances of the lines. Then, the terminal which senses the voltage across load is prepared apart from the output terminal of DC-DC converter, and it leads to the load, and the voltage across load is adjusted so that it is not changed largely. This method is called remote sensing. When the lines becomes long, the usual method of adjusting the voltage across load cannot suppress enough the change of it. In this paper, the robust digital controller for suppressing the change of the voltage across load is proposed. Experimental studies using DSP demonstrate that this type of digital controller is effective to suppress it.