Brightness control in a floor lamp. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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The schematic diagram of the regulator is shown in fig. 1. Its key element is the thyristor VS1, the turn-on phase of which in each half-cycle depends on the time constant of the circuit (R1 + R2) C1.
Ris.1
The device allows you to change the brightness of a lamp with a power of up to 200 watts over a wide range. In general, its load can be any device of appropriate power that does not contain any noticeable inductance: a soldering iron, a boiler, etc.
If the KTs405A diode bridge is replaced with another one with high operating currents, then the load can be increased, in the limit - up to 2 kW. In this case, the thyristor and bridge diodes will need to be placed on heat sinks.
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The latest update of the Global Atmospheric Research Emissions Database (EDGAR) and statistics on energy use and impacts such as gas flaring and cement production show that global CO2 emissions continued to rise in 2011, despite reduction in OECD countries. The emission of carbon dioxide is considered the main cause of global warming. Last year, CO2 emissions increased by 3%, reaching a record 34 billion tons.
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If the current level of emissions does not decrease, then over the next two decades, the average global temperature of our planet, according to calculations, could increase by 2 degrees Celsius.
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