Image printer with common filter to filter common operating frequency band of fixing module and switch mode power supply module

An image forming apparatus, comprising:

• a high frequency generator to receive an input current and to generate a current having a first high frequency in a predetermined frequency band using the received input current;
• a fixing unit to generate heat using the generated current generated by the high frequency generator to fix toner to a print medium;
• a switch mode power supply unit to receive the input current, to generate a power supply current having a second high frequency in the predetermined frequency band using the received input current, and to supply the power supply current to the high frequency generator to power the high frequency generator;
• and
• a band pass filter to filter the input current at the predetermined frequency band and to output the filtered input current to the high frequency generator and the switch mode power supply unit as the input current to reduce harmonic waves in the current having the first high frequency and the power supply current having the second high frequency.

An image forming apparatus, comprising:

• a band pass filter to filter an input AC current at a predetermined frequency band;
• a fixing module to use the filtered AC current to generate a first high frequency signal in the predetermined frequency band, and to use the generated first high frequency signal to generate heat to fix an image on a print medium;
• and
• a switch mode power supply module to use the filtered AC current signal to generated a second high frequency signal in the predetermined frequency band and to supply the second high frequency signal to the fixing module to power the fixing module.

A high frequency generation unit usable with a fixing unit of an image forming apparatus, the high frequency generating unit comprising:

• a high frequency generator to operate at a predetermined operating frequency and to generate a high frequency current;
• a switch mode power supply to operate at the same predetermined operating frequency as the high frequency generator and to supply the high frequency generator with operating power;
• and
• a band pass filter to filter harmonic waves in the predetermined operating frequency of the high frequency generator and the switch mode power supply.

A method of fixing an image to a print medium, comprising:

• filtering an input current at a predetermined frequency band;
• generating a high frequency current in the predetermined frequency band using the filtered input current in a high frequency generator;
• generating a power supply current in the predetermined frequency band using the filtered input current and supplying the power supply current to the high frequency generator;
• and
• generating heat using the high frequency currency and applying the generated heat to the print medium to fix the image thereon.