The invention discloses an intelligent power supply in the field of power supply. The original edge of a
transformer is provided with a plurality of sets of suckers; the input end of the power supply is correspondingly connected with a plurality of the suckers through a plurality of bidirectional controlled silicons in parallel connection; the control
electrode of each bidirectional controlled
silicon is correspondingly connected with a plurality of output pins of a singlechip; a
voltage sampling circuit is traversed between two electrodes of the input end of the power supply; after a sampling
signal is transmitted to a
voltage detection circuit through the
voltage sampling circuit, is detected, is converted into a
digital signal through an A / D convertor; the
digital signal is transmitted to the singlechip and is calculated through the singlechip to give a
control signal for the corresponding control
electrode of the bidirectional controlled
silicon so as to control the conduction of the corresponding bidirectional controlled
silicon and change the effective turn number of the primary side of the
transformer in order that the
secondary side of the
transformer outputs stable voltage; and the
secondary side of the transformer is connected with the output end of a power inserter. The intelligent power supply can be used as the power supply of a
cable television network and has wide voltage stabilizing range, low construction cost, high efficiency, no
noise, the output of pure
sine wave and no
waveform distortion.