Electrolytic Capacitor

Electrolytic capacitor is a component of the LED driver, with function to offer high capacitance value on to the circuit board.  

Many people argue that the electrolytic capacitor is the bottleneck factor of LED lights. This is often true especially when many LED light manufactures apply low quality electrolytic capacitor for low cost purpose, therefore the capacitor wears out much earlier when the LEDs still working well.

electrolytic capacitor

However, it need to be noted that the operating conditions directly affect the life of an aluminum electrolytic capacitor. The ambient temperature has the largest effect on life. The relationship between life and temperature follows a chemical reaction formula called Arrhenius’ Law of Chemical Activity. Put it simply, the law says that life of a capacitor doubles for every 10℃ decrease in temperature (within limits). A general way to describe the rated lifespan of capacitor is by the expectancy hours under 105℃ as default. For example, if the operating temperature of an electrolytic capacitor with 5000Hrs (at 105℃) rated lifespan is 95℃, it’s expectancy life is doubled to 10,000Hrs, and so on, when the operating temperature decreases to 85℃, it’s life can be expected to reach 20000Hrs. So as long as the capacitor can be designed to operate under a temperature low enough, it’s useful lifespan can be long enough. Besides, voltage derating also increases the life of a capacitor, but to a far lesser extent, as compared to temperature deratings. Internal heating, caused by the applied ripple current, reduces the projected life of an aluminum electrolytic capacitor. From this standpoint, the thermal design is key to the life limits of LED lights.

 

Our LED fixtures adopt the high quality, and long lifespan electrolytic capacitor produced by the well known manufactures. In addition, we use more effective methods both in the design of the light fixtures to decrease the operating temperature of the electrolytic and in the design of LED driver.

 

(1) Using the electro-thermal separation technology to separate the drive circuit and LED light source, reduce the contact area, thus avoiding the heat being transmitted from the light emitting diode to the electrolytic capacitor.

 

(2) We glue the LED Driver integrated (in insulation and thermal Electronic potting adhesive) , making the high temperature electrolytic capacitor being decreased by the other low temperature components on the circuit board.

 

(3) Under the premise of meeting the basic requirements of the dustproof and waterproof, when designing the structure of the fixture, we avoided placing the driver in the internal enclosed spaces, and tried best to let the driver contact with the outside air. Compared to heat radiating through the air medium, heat exchange through the air convection is much more efficient.

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