  We predict that an anisotropic charge Kondo effect appears in a triple
quantum dot, when the system has two-fold degenerate ground states of (1,1,0)
and (0,0,1) charge configurations. Using bosonization and refermionization
methods, we find that at low temperature, the system has the two different
phases of massive charge fluctuations between the two charge configurations and
vanishing fluctuations, which are equivalent with the Kondo-screened and
ferromagnetic phases of the anisotropic Kondo model, respectively. The phase
transition is identifiable by electron conductance measurement, offering the
possibility of experimentally exploring the anisotropic Kondo model. Our charge
Kondo effect has similar origin to that in a negative-U Anderson impurity.
