Flyback converter and output voltage acquisition method therefor and apparatus thereof

An apparatus for acquiring an output voltage of a flyback converter, comprising:

• a reference voltage acquisition module, configured to acquire a reference output voltage of the flyback converter;
• a voltage sampling module, configured to sample a current output voltage of the flyback converter within a reset time of each switching period of M continuous switching periods of the flyback converter, wherein M is a positive integer;
• and
• an output voltage acquisition module, configured to successively approximate the current output voltage by using a dichotomy method according to the reference output voltage and the current output voltage until the M switching periods end, and obtain the output voltage of the flyback converter;
• wherein the reference voltage acquisition module is specifically configured to:
• calculate a voltage difference value between a preset digital output voltage upper limit and a preset digital output voltage lower limit;
• add one half of the voltage difference value to the preset digital output voltage lower limit to obtain a first digital value;
• and
• perform a digital-to-analog conversion on the first digital value to obtain an initial value of the reference output voltage.

A flyback converter, comprising an apparatus for acquiring an output voltage, wherein the apparatus for acquiring the output voltage comprises:

• a reference voltage acquisition module, configured to acquire a reference output voltage of the flyback converter;
• a voltage sampling module, configured to sample a current output voltage of the flyback converter within a reset time of each switching period of M continuous switching periods of the flyback converter, wherein M is a positive integer;
• and
• an output voltage acquisition module, configured to successively approximate the current output voltage by using a dichotomy method according to the reference output voltage and the current output voltage until the M switching periods end, and obtain the output voltage of the flyback converter;
• wherein the reference voltage acquisition module is specifically configured to:
• calculate a voltage difference value between a preset digital output voltage upper limit and a preset digital output voltage lower limit;
• add one half of the voltage difference value to the preset digital output voltage lower limit to obtain a first digital value;
• and
• perform a digital-to-analog conversion on the first digital value to obtain an initial value of the reference output voltage.