In medium- and high-voltage applications, the traditional isolated gate driver uses dual isolation channels to transfer the drive signal and drive power respectively, which suffers from a long delay, a large size and a high cost. The single isolation channel with signal-power integrated transmission is crucial for achieving the integration, low cost and high performance of power devices and driver systems. A time-division multiplexing transmission architecture and the corresponding method are proposed to overcome the limitations in the existing elementary signal-power integrated transmission methods, such as limited duty cycle, unidirectional transmission and unstable power transfer, providing an efficient and reliable design scheme by focusing on key technologies including the transmission timing, modulation method and implementation circuit. Aimed at the requirement that the drive signal should be transferred with high fidelity in a wide range, the key factors that restrain the drive signal transmission performance are analyzed in depth, and the laws of interactions among drive signals, modulation carriers and band-width are also formulated, so as to support the transmission of milliwatt-level drive signal and watt-level drive power theoretically. Moreover, the shared-link time-division multiplexing technology is used to address challenges in the stable transmission of drive signals and compatible transmission of bidirectional signals under the full-duty cycle range of drive signals during the integrated transmission, and an integrated driver based on an isolated flyback converter is developed, enabling the forward transmission of drive signals and power by means of pulse duty-cycle modulation and asynchronous timing, as well the reverse transmission of fault signals realized by pulse amplitude modulation. The compact prototype (20 mm×17 mm×16 mm) adopted a planar printed circuit board (PCB) isolated transformer, and the duty cycle range of drive signals covered 0%-100%, with a signal frequency up to 100 kHz. As a result, the full-duplex integrated transmission of drive signals, drive power and reverse fault signals was realized.