LED (Light-Emitting Diode) television two-in-one power supply circuit and LED television

Abstract

The invention discloses an LED (Light-Emitting Diode) television two-in-one power supply circuit and an LED television. The LED television two-in-one power supply circuit comprises a rectifying and filtering module, a PFC (Positive Feedback Circuit) module, a reverse excitation circuit module, an LLC (Logical Link Control) half-bridge resonant module, a constant-current module, a feedback module and an LLC control module. Alternating current is partitioned into two paths after being rectified and filtered and corrected by the PFC module; one path is used for supplying power to a motherboard core through the reverse excitation circuit module; and the other path is used for supplying power to an LED light bar through the LLC half-bridge resonant module. Power is supplied separately with two paths since voltages needed by the LED light bar and the motherboard core are different, so that the power supply efficiency is increased, and the element cost is lowered. The LLC control module is fed back to the primary stage of an LLC transformer of the LLC half-bridge resonant module, so that the resonant groove state is monitored in real time, and complete protection is realized. Moreover, the transformer does not need to be driven, so that the quantity of safety devices is small.

Description

technical field [0001] The invention relates to the field of a switching power supply and an LED drive circuit, in particular to a two-in-one power supply circuit for an LED TV and an LED TV. Background technique [0002] The existing traditional high-power TV power supply, its motherboard power supply and backlight drive, is output by an LLC circuit with two stable voltages: 12V for the motherboard and LCD glass, 24V or other voltages as the input voltage of the LED constant current backlight driver, LED constant current drive boosts the constant current to the current required by the LED strip by the Boost circuit. [0003] Specific methods such as figure 1 As shown, after the AC input is rectified and filtered and PFC circuit, two voltages are output through the LLC half-bridge resonance, one 12V is directly supplied to the core of the motherboard, and the other intermediate voltage is powered to the LED light bar after being boosted and constant current use. In this t...

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Problems solved by technology

[0005] In view of the deficiencies of the prior art above, the purpose of the present invention is to provide a two-in-one power supply circuit for LED TV and LED TV, which effectively solve the problem of low efficiency, high cost and inability to protect the primary side of the LED TV power supply circuit. The problem

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