A novel fast response current-mode DC-DC converter using ICO

In this paper, a novel digital fast response current- mode dc-dc converter using the current controlled oscillator (ICO) and the digital fast PID control is proposed. The ICO is a low price and can be transformed to digital value quickly when the reactor current is detected. The digital fast PID control means the P and ID control are processed parallel. The sampling period of P control is shorter than the switching period. The paper studied to the transient response of proposed circuit. The proposed digital control circuit shows superior transient characteristics in spite of simple circuit configuration. As results, in the proposed circuit, the conventional time of output voltage within 1% of desired voltage is shortened to 89% compared with the conventional PID control method. Furthermore, the under- shoot of output voltage and the overshoot of reactor current are suppressed to 61% and 30%, respectively.