TV screens are getting bigger and bigger, the wattage of audio is getting bigger and bigger, and the power consumption of black appliances is getting bigger and bigger. The issue of energy conservation has become increasingly prominent. Household appliances consume 15% of the country's total energy consumption, and home appliance energy conservation is an important issue. However, most of the home appliance energy-saving objects that are of concern at home and abroad are white goods (air conditioners, refrigerators, washing machines, microwave ovens, etc.), but few people mention energy-saving problems with black household appliances (audio and video products such as televisions and stereos). Only manufacturers who advertise "energy-saving air conditioners", and no manufacturers to play "energy-saving TV" ads, do black appliances do not need to save energy?
Black power saving problems are increasingly prominent
In fact, the energy saving of black household appliances at work is an important energy-saving link, because the daily working hours of black household appliances are usually greater than the working hours of white goods.
The main energy consumption of black household appliances is located at the terminal output, that is, the display for the eyes and the speakers for the ears. In principle, the larger the size of the display, the more power it consumes, and the louder the speaker, the more power it consumes. In recent years, televisions with screens larger than 29 inches have become the best-selling TV products, and audio with wattages higher than 20 watts has also been welcomed by users. Whether it is a CRT (picture tube) display terminal or a liquid crystal display terminal, the larger the screen, the more power is consumed. Similarly, in audio products, the power consumed by high-power audio amplifiers, home theaters, etc. is also considerable.
At present, the number of TV sets in China has exceeded 410 million. If each TV can save 10 watts of electricity, it can save 4.5 billion kWh per year by watching 3 hours per day. This is a very impressive number. In addition, the performance of black household appliances is getting higher and higher in recent years, the TV screen is getting bigger and bigger, the wattage of the sound is getting bigger and bigger, the power consumption of black household appliances is getting bigger and bigger, and the problem of energy saving is becoming more and more prominent.
How can black appliances achieve power savings without sacrificing performance?
CRT energy saving: using class D amplifier
China produced 88.07 million TV sets in 2007, of which 70% are CRT TVs, and there are about 60 million CRT monitors in use in China. So CRT energy conservation is still the most important issue.
The power consumption of a CRT is mainly determined by the screen size. The larger the screen, the higher the anode voltage and the more power is consumed. At the same time, the larger the screen, the greater the deflection current required. In terms of the circuit that produces the sawtooth wave, there is still great potential for energy-saving measures.
Although the sawtooth current required for vertical deflection is completely determined by the deflection angle, the same amount of sawtooth is generated, and the required power is saved. Almost all vertical deflection amplifiers currently use Class AB amplifiers to power up the vertical deflection sawtooth. This class AB deflection amplifier operates in a linear state with low efficiency. Usually only 20%-30% efficiency at low output. Therefore, Class AB amplifiers require a large heat sink to dissipate heat.
A new class D amplifier has emerged on the market. This amplifier allows the final stage power transistor to operate only in the switching state, which amplifies the analog signal and achieves 80%-90% efficiency.
By applying this amplifier to a vertical deflection amplifier, you can save a lot of energy. For example, a Class AB deflection amplifier would have required 6.94 watts, while a Class D deflection amplifier would cost as much as 2.74 watts, saving 4 watts of power. Another larger screen vertical deflection circuit, which originally required 10.8 watts, used a Class D amplifier and only required 4.6 watts, saving 6.2 watts. Therefore, on average, after using a Class D amplifier in the vertical deflection of a TV set, it can save about 5 watts.
Although 5 watts is not a big number, the number of domestic CRT TV sets has reached 400 million, which is an average of 3 hours per day, saving 2.19 billion kWh per year. The number of CRT computer monitors is 60 million, assuming 8 hours a day, saving 876 million kWh a year. The sum of the two is as high as 3.066 billion kWh, and the figures are considerable.
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