To address the complex issue of information exchange between DC-DC converters, this paper proposes a method that integrates power and information by introducing perturbations into the power control loop. By superimposing binary frequency shift keying (2FSK) signals as perturbations in the traditional power control loop of the DC-DC converters, data information is embedded into the conventional pulse-width modulation (PWM) signal, enabling the PWM signal to simultaneously carry data information, thus achieving the integration of power and information. First, this paper presents a power/data dual carrier modulation scheme based on 2FSK and a real-time sliding discrete Fourier transform (SDFT) demodulation scheme. Subsequently, it is evident from the small-signal modeling and analysis of the power-information integration model of the Buck converter that reducing the input impedance can enhance the signal-to-noise ratio of communication. Finally, an experimental set-up consisting of two parallel Buck converters is constructed for validation. Experimental results demonstrate stable communication at a rate of 3 kb/s in steady-state and load transient conditions, confirming the feasibility of the proposed method. This method enables DC-DC converters to simultaneously perform power conversion and data transmission, thereby enhancing digitization and intelligence levels.