Linear voltage regulation circuit and transformer

The invention discloses a linear voltage regulation circuit and a transformer. The linear voltage regulation circuit comprises a square wave signal generation module, a current input module, a current mirror module and a voltage regulation module, the square wave signal output end of the square wave signal generation module is connected with the current input module; the output end of the current input module is connected with a first current branch of the current mirror module; the power supply end is connected with the voltage regulation module; a reference voltage node of the voltage regulation module is connected with a second current branch of the current mirror module; the square wave signal output end is used for outputting a square wave signal; the current input module is used for converting the square wave signal into a direct current signal; the voltage regulation module is configured to change the voltage of the power supply end when the voltage of the reference voltage node changes; when the duty