Digital-controlled switching mode power supplies (SMPS) are popular in the fields of relatively large power supply system. The digital controller is consisted of DSPs or microprocessors performing with software. By contrast, such as on-board SMPSs, adapting digital controller isn't still popular because of its cost or response characteristics even if the controllers are constructed by FPGA or custom LSI which is hardware-logic base. This paper will discuss about the proposed hardware logic type digital controller for on-board SMPS, which is very simple and unique design. And, accuracy improved output voltage detection method for the proposed digital controller is proposed. The some experiments are done. And the results show the validity of the proposed circuits.
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