© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. We present our recent results from Suzaku and Swift Time-Of-Opportunity observations of the Galactic black hole transients MAXI J1305-704, H 1743-322, and 4U 1630-472. The wide-band high-quality data obtained in the low/hard state (the former two sources) and in the very high state (4U 1630-472) enable us to constrain the structure of the accretion flow in various X-ray luminosities. We find that all the spectra, including the 4U 1630-472 data, taken 4 days after the detection of the baryonic jet [2], contain strong Comptonised components and suggest disc truncation. In the H 1743-322 data, a low-frequency QPO is detected, whose frequency is found to correlate the X-ray luminosity and photon index. This may be explained by the evolution of the disc truncation radius. Considering these results, we discuss the inner disc structure of black hole binaries over a wide range of mass accretion rates.