In　this　paper,　we　consider　the　compressible　quantum　Navier-Stokes-Poisson　equations　with　a　linear　density-dependent　viscosity.　By　the　use　of　a　singular　pressure　close　to　vacuum,　we　prove　the　global-in-time　existence　of　weak　solutions　in　a　three-dimensional　torus　for　large　data　in　the　sense　of　distribution.　Published　by　AIP