Power supply circuit

A method for controlling a power supply circuit comprising:

• generating a pulse width modulation (PWM) signal by a PWM signal generation circuit to control a voltage converter circuit;
• converting a feedback voltage of the voltage converter circuit into a digital signal in accordance with a difference between the feedback voltage and a reference voltage by an analog/digital (A/D) converter circuit;
• and
• generating a first control signal to control a duty cycle of the PWM signal and a second control signal to control an updating cycle of the duty cycle of the PWM signal in accordance with the digital signal by a PWM signal control circuit,
• wherein the updating cycle is configured so as to be longer as the feedback voltage is closer to the reference voltage.

A method for controlling a power supply circuit comprising:

• generating a pulse width modulation (PWM) signal by a PWM signal generation circuit to control a voltage converter circuit;
• converting a feedback voltage of the voltage converter circuit into a digital signal in accordance with a difference between the feedback voltage and a reference voltage by an analog/digital (A/D) converter circuit;
• smoothing the digital signal to generate a smoothed digital signal by a digital filter circuit;
• generating a first control signal to control a duty cycle of the PWM signal and a second control signal to control an updating cycle of the duty cycle of the PWM signal in accordance with the smoothed digital signal by a PWM signal control circuit;
• and
• generating the reference voltage by a reference voltage generation circuit,
• wherein the updating cycle is configured so as to be longer as the feedback voltage is closer to the reference voltage.

A method for controlling a power supply circuit comprising:

• generating a pulse width modulation (PWM) signal by a PWM signal generation circuit to control a voltage converter circuit;
• converting a feedback voltage of the voltage converter circuit into a digital signal in accordance with a difference between the feedback voltage and a reference voltage by an analog/digital (A/D) converter circuit;
• smoothing the digital signal to generate a smoothed digital signal by a digital filter circuit;
• generating a first control signal to control a duty cycle of the PWM signal and a second control signal to control an updating cycle of the duty cycle of the PWM signal in accordance with the smoothed digital signal by a PWM signal control circuit;
• generating the reference voltage by a reference voltage generation circuit;
• and
• generating a clock signal by a clock generation circuit,
• wherein the clock generation circuit is electrically connected to the digital filter circuit, and
• wherein the updating cycle is configured so as to be longer as the feedback voltage is closer to the reference voltage.