Voltage conversion device, power supply system, and interference suppression method

A power supply system, comprising:

• a first voltage conversion device, coupled to a first ground terminal and a second ground terminal, wherein the first voltage conversion device converts a first input voltage into a first output voltage according to a first switching signal and a first switching terminal signal;
• and
• a second voltage conversion device,
• wherein the second voltage conversion device comprises:
• a first input terminal to obtain the first input voltage;
• a feedback controller, coupled to the second ground terminal to provide a second switching signal based on a feedback voltage, wherein the feedback voltage is generated based on a second output voltage of the second voltage conversion device;
• a masking circuit, coupled to the feedback controller to generate a processed switching signal by masking a part of time period of the second switching signal according to one of the first switching signal and the first switching terminal signal;
• and
• a driving circuit, coupled to the first input terminal and the masking circuit to provide the second output voltage according to a second input voltage and the processed switching signal.

An interference suppression method for a voltage conversion device, wherein the interference suppression method comprises:

• providing a first switching signal based on a feedback voltage, wherein the feedback voltage is generated based on an output voltage of the voltage conversion device;
• generating a processed switching signal by masking a part of time period of the first switching signal according to one of another switching signal and another switching terminal signal of another voltage conversion device;
• and
• providing the output voltage according to a first input voltage and the processed switching signal,
• wherein a step of generating the processed switching signal by masking the part of time period of the first switching signal according to the one of the another switching signal and the another switching terminal signal of the another voltage conversion device comprises:
• determining a triggering time point of the one of the another switching signal and the another switching terminal signal;
• generating a mask signal according to the triggering time point, wherein the mask signal comprises a masking pulse corresponding to the triggering time point;
• and
• generating the processed switching signal by masking the part of time period of the first switching signal based on the masking pulse in the mask signal.