High frequency dc voltage converter of the quasi-resonant buck type

A method for conversion of a voltage by means of a DC voltage converter of the quasi-resonant Buck type, the voltage converter comprising an input port having a first terminal intended to receive a voltage level to be converted, an output port having a first terminal designed to supply a converted voltage level, a ground line connecting a second terminal of the said input port to a second terminal of the said output port, a first switch connected in series to the said first terminal of the input port and a regulation circuit having an input terminal connected to the said first terminal of the output port of the converter and an output terminal connected to a control terminal of the said first switch, the method comprising the steps for:

• generation of a ripple voltage, rising or falling depending on a closed or open state of the said first switch;
• generation of a setpoint signal proportional to a difference between an average level of converted voltage and a reference voltage;
• comparison between the said setpoint signal and the said converted voltage level to which the said ripple voltage has been added;
• and, depending on the result of the said first comparison:
• generation or not of an activation signal controlling the closing of the said first switch for a predefined period.