The company let us experimentally develop COB packaged LED fluorescent lamps.
First, I tested it with a silver-plated aluminum substrate . Although it seems that the heat is not enough, the cost will be much lower. If this solution is feasible and adopted by other manufacturers, we will die. I am afraid that even the work will be lost. Try it, don't say it again.
The thermal conductivity of the selected silver-plated aluminum substrate is 2.5W/M·K, and the glue is expensive. As a result, the measured light decay is still unqualified. It is not acceptable to use an aluminum substrate for COB.
The price of copper is about 3.5 times that of aluminum. The thermal conductivity is much better. Shenzhen has silver-plated copper substrates for sale. After testing, COB packaged LED fluorescent lamps are qualified under less than 6W, and high power is not enough. The copper substrate for COB is not good either.
The COB packaged LED fluorescent lamp was tested with a thermal conductivity of 21 W/M·K ceramic substrate. As a result, of course, Hong Kong and Hong Kong, but such products are also expensive. Ceramic substrates for COB are still not working.
The conclusion is that current COB packaged LED fluorescent lamps are simply not feasible.
However, according to Chengdu LED lights peers Liugong analysis, there are hopes for COB package LED fluorescent lamps in the future. There are two advantages and one disadvantage. Advantage 1: Once the mass production price of the ceramic substrate is greatly reduced. Advantage 2: When the luminous efficiency of the LED chip reaches 200LM/W, the heat generation will be small, and the copper substrate for the COB package is sufficient, even the aluminum substrate. The disadvantage is that in the future, domestic placement machines and other equipment are cheap and easy to use, and the total cost of COB is more difficult to compete with the total cost of SMT.
LED fluorescent lamp COB package copper substrate or ceramic substrate is really unknown, because it is affected by many uncertain factors.
High voltage isolation switches
GW9 outdoor AC high-voltage disconnector is an AC 50H outdoor device, which is used in the power supply network with frequency of 50HZ and 10kV. It is used for the switching of high-voltage lines with voltage and without load, and for the electrical isolation of the overhauled high-voltage bus, circuit breaker and other electrical equipment from the live high-voltage lines. It can also be used to open and close very small capacitive current and inductive current.
GW9 outdoor high-voltage disconnector features:
They are composed of base, post insulator, conductive part and mechanism part. Knife type structure is adopted to open and close the circuit to cut off and close the line. Each phase of the knife is composed of two conductive blades, which are equipped with compression springs on both sides. The contact pressure required for switching the knife can be obtained by adjusting the height of the springs. When the switch is opened and closed, the insulating hook bar operating mechanism can be used for closing movement
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