Patent ID: 11900855
Assignee: HISENSE VISUAL TECHNOLOGY CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. 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.