Philips has launched smart street lights in Madrid, Buenos Aires and Los Angeles, while providing bright night lighting and Internet access. Recently, Philips announced that it has partnered with British telecommunications company Vodafone to add Vodafone M2M SIM cards to its smart streetlights. This move will allow them to connect to Philips CityTouch management platform for remote control.
It is reported that just by opening the webpage landing control system, you can see the details of all street lights on the city map, including the status of each street light. With a simple mouse click, managers can turn on, turn darkening, and turn off city lights. In addition, managers can find bulbs that need to be repaired and replaced in a timely manner.
Two - way trigger diode, also known as two - end ac device (DIAC), and two - way thyristor at the same time.Because of its simple structure and low price, it is often used to trigger the bidirectional thyristor, and can also constitute overvoltage protection circuits.Construction, symbol and equivalent circuit of a bidirectional trigger diode.
Also commonly used in the overvoltage protection, timing, shift equal circuit, Figure 2 is the overvoltage protection circuit composed of bidirectional trigger diode and bidirectional thyristor.When the transient voltage exceeds the DIAC and Ubo, the DIAC quickly conducts and triggers the bidirectional thyristor to also conduct, so that the following load is protected from overvoltage damage.
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