Display apparatus

A display apparatus, comprising:

• a display screen configured for image display;
• a sound reproduction device configured to play sound;
• a power supply circuit configured to provide electric energy to a load of the display apparatus;
• and
• a controller;
• wherein the power supply circuit comprises:
• a rectifier circuit and a compensation circuit;
• wherein
• the rectifier circuit is configured to convert alternating current into direct current;
• and
• the compensation circuit is configured to compensate a parasitic signal of a synchronous rectification Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) in the rectifier circuit;
• wherein the rectifier circuit comprises a closed loop, wherein the closed loop includes a secondary coil, the synchronous rectification MOSFET and a load;
• and
• the compensation circuit comprises:
• an electromagnetic induction coil placed in the closed loop of the rectifier circuit;
• wherein
• the electromagnetic induction coil is configured to generate a compensation signal based on a closed loop current in the closed loop, wherein the compensation signal is used to compensate the parasitic signal of the synchronous rectification MOSFET in the rectifier circuit;
• wherein the controller is configured to control the synchronous rectification MOSFET,
• a source of the synchronous rectification MOSFET is connected with the secondary coil and a first terminal of the electromagnetic induction coil, a drain of the synchronous rectification MOSFET is connected with the load in the closed loop and the controller respectively:
• and a second terminal of the electromagnetic induction coil is connected with the controller;
• the electromagnetic induction coil is configured to generate the compensation signal between the first terminal and the second terminal based on the closed loop current in the closed loop;
• the controller is configured to generate a control signal for controlling the synchronous rectification MOSFET according to a voltage between the second terminal of the electromagnetic induction coil and the drain of the synchronous rectification MOSFET.