Patent ID: 11949226
Assignee: NATIONAL CHUNG HSING UNIVERSITY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC B  H

Claim 1:
2. An external power supply system for a spindle which is connected to a control system providing power to a drive system able to generate an electric field having a power factor and transfer the electric field to a positive electrode and a negative electrode comprising:
a tool holder which includes a pull stud, an exterior conical surface, an end ring, a contact positive electrode, and a contact negative electrode; the contact positive electrode and the contact negative electrode are mounted to a surface of the end ring and used for transferring an external power source having the power factor while being aligned with the positive and the negative electrodes of the spindle and further receiving the external power source with the power factor,
a rectifier circuit which is used for converting the external power source with the power factor into a rectified output signal with the power factor through step-down transformation; the rectifier circuit allows a transmission level to pass according to a contact potential input by the external power source, applies proportioning control with integral and derivative functions to an output waveform of the transmission level, and then transforms a modulation level which is used for control of the transmission level of the rectified output signal to be no larger than a threshold;
an overvoltage protection circuit used to check whether the rectified output signal is larger than an overvoltage signal; the overvoltage signal is at an operating potential when the rectified output signal is smaller than the overvoltage signal while the overvoltage signal is at a non-operating potential once the rectified output signal is larger than the overvoltage signal; and
a buck/boost converter which is coupled to the overvoltage protection circuit for receiving the rectified output signal output at the operating potential and converting the rectified output signal to an output voltage according to the power factor of the rectified output signal; the output voltage is provided to a load of a power supply which is selected from the group consisting of a low voltage power supply, a high voltage power supply, and a constant voltage power supply.