Patent ID: 7269974

Claim:
A bushing temperature controller, comprising: a main current supply unit which supplies a main current to a bushing for accommodating molten glass; and a regulation current supply unit comprising a transformer; the primary side of said transformer comprising two primary windings, wherein the electric power is separately supplied to each of said primary windings so that the phase of the electric current applied to one of said primary windings is opposite to that of the other; the regulation current supply unit further comprising two regulators, which regulate the electric power into said primary windings respectively; the regulation current supply unit further comprising a control unit, which outputs a control signal to said regulators; said regulators receiving the control signal separately; wherein at least two regulation current supply units are provided and each of the regulation current supply units supplies the current for regulation to a region at each end of the region to which the main current supply unit applies the current; and wherein said primary windings are connected in series.