Hisense LED LCD TV backlight control technology to achieve power consumption reduced by about 60%

Hisense LED LCD TV is China's first batch of listed LED TV products, its dynamic partition control LED backlight technology to achieve the LCD TV energy saving.

Hisense in the flat-panel TV green energy saving technology has made two efforts. First, the power supply design, two is the whole system design.

Power design, one is to take measures to improve the standby power supply frequency, improve the overall conversion efficiency, so that the standby power conversion efficiency of more than 90%. Moreover, a dedicated standby power supply and a standby MCU are added on the existing TV circuit. When using the relay, the main power supply circuit is completely cut off, so that the load power consumption is greatly reduced. The standby power consumption is less than 0.1 watts.

Two is to improve the efficiency of the traditional single power supply conversion efficiency will be increased to more than 90%. The current power scheme, the efficiency is generally around 82%. Hisense began using the conversion efficiency of 87% double forward power supply scheme from 2005, realize zero voltage switch of the main switch, the loss is reduced, and the invalid return circuit through the conversion of energy conversion process, achieved without clamping circuit loss, improve efficiency. In the power supply, the rectifier diode is used to reduce the conduction loss and improve the efficiency. By 2007 to achieve the conversion efficiency of up to 90% of the LLC program batch production.

The three is the use of a new power system structure, improve conversion efficiency. LCD TV screen because of the reasons, the popular way of power supply and power inverter is separate from the work. General AC PFC, the output of the DC-DC DC voltage (usually 24V), and then through the inverter circuit to achieve high voltage DC-AC lighting. Hisense broke through the technical difficulties of high voltage conversion and high pressure safety isolation, in the Chinese manufacturers to take the lead in the removal of intermediate DC-DC conversion link, the PFC directly through the DC-AC output high-voltage lighting. To achieve the combination of power and inverter, so that the overall efficiency of more than 15%, up to 87%, greatly reducing the power consumption of the whole machine.

In the design of the whole system, Hisense uses the dynamic backlight control technology, which is based on the change of the content of the image, and dynamically adjust the backlight, which reduces the energy consumption of the whole system by more than 30%. In addition, Hisense flat-panel TV also uses a low-power module, you can make the whole machine power consumption is the most direct and effective reduction.

Source: Nikkei BP