Power circuit structure and LED liquid crystal television

Abstract

The invention relates to a power circuit structure and an LED liquid crystal television adopting the power circuit structure. The power circuit structure comprises a rectifying circuit, a PFC (Power Factor Correction) backlight drive circuit, a PF (Power Factor) value correction inductor and a flyback circuit, wherein the rectifying circuit is used for receiving alternating-current input, rectifying the alternating-current input and then outputting a first direct-current voltage; the PFC backlight drive circuit is electrically connected with the rectifying circuit so as to receive the first direct-current voltage and is used for carrying out PF correction on the first direct-current voltage so as to output a second direct-current voltage to supply power to a backlight source and carrying out constant-current control on the backlight source; the PF value correction inductor is electrically connected with the rectifying circuit to receive the first direct-current voltage and output a third direct-current voltage; and the flyback circuit is electrically connected with the PF value correction inductor to receive the third direct-current voltage and output a fourth direct-current voltage so as to supply power to a load the power of which is lower than that of the backlight source. Therefore, according to the power circuit structure and the LED liquid crystal television, the purposes of reducing system cost and improving system efficiency and reliability are achieved at the same time as PF value and harmonic wave factor are ensured.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a power supply circuit structure and an LED liquid crystal television adopting the power supply circuit structure. Background technique [0002] Such as figure 1 As shown, the traditional LED LCD TV 100 includes a power supply circuit structure composed of a rectifying filter circuit 11, a PFC circuit (power factor correction circuit) 13, a standby circuit 15, an LCC circuit 17 and an LED drive circuit 19, and a TV main board 22 And liquid crystal screen 24. Here, the LCC circuit 17 is a circuit form of a series-parallel resonance circuit, the TV main board 22 includes circuits such as audio and video decoders, and the LCD screen 24 includes an LED backlight and a liquid crystal panel. In addition, the rectification and filtering circuit 11 receives the AC input and performs rectification and filtering to output a DC voltage to the PFC circuit 13. The PFC circuit 13 corr...

AI Technical Summary

Problems solved by technology

[0003] It can be seen from the above that since the power circuit structure of the traditional LED LCD TV 100 adopts a multi-stage circuit mode of PFC circuit + LLC circuit + LED drive circuit + standby circuit, each stage of the circuit has a certain loss, which leads to low efficiency of the power supply of the whole machine , the system cost is higher

[0004] With the improvement of LED backlight technology, the overall power of today's LED LCD TVs has been significantly reduced; therefore, it has become possible to improve the problems of low power supply efficiency and high system costs of traditional LED LCD TVs

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