POWER CONTROL DEVICE FOR DYNAMICALLY ADJUSTING FREQUENCY

摘要

A power control device for dynamically adjusting frequency includes an electric transformer, a controller, a loading feedback unit, and a switching transistor. The electric transformer includes a first side induction coil connected to an input power unit, a second side induction coil connected to a loading unit to generate an output power by electromagnetic induction with the first side induction coil, and an auxiliary induction coil generating a power sensing signal by electromagnetic induction with the first side induction coil. The loading feedback unit generates a loading feedback signal. The controller determines the level of loading based on the loading feedback signal and further detects the valleys of the power sensing signal so as to change the switching signal which controls the switching transistor at the optimal one of the valleys.

主权项

1. A power control device for dynamically adjusting frequency, electrically connected to an input power unit and a loading unit to transform an input power into an output power supplying the loading unit, comprising:
an electric transformer comprising a first side induction coil connected to the input power unit, a second side induction coil connected to the loading unit for generating the output power by electromagnetic induction with the first side induction coil, and an auxiliary induction coil generating a power sensing signal by electromagnetic induction with the first side induction coil; a loading feedback unit connected to the second side induction coil and the loading unit for generating a loading feedback signal corresponding to the output power; a controller receiving the power sensing signal and the loading feedback signal to generate a switching signal based on a control criterion; and a switching transistor connected to the first side induction coil and receiving the switching signal to control a conducting current and/or a conducting voltage of the first side induction coil so as to control a current and/or a voltage of the second side induction coil, wherein the control criterion including: determining a level of loading based on the loading feedback signal; detecting valleys of the power sensing signal; and selecting an optimal valley number based on the level of loading to change the switching signal which controls the switching transistor.