Murata displays the LED lighting power supply without electrolytic capacitors

Murata where from July 21, 2010 opening of the "TECHNO FRONTIER 2010 (power system development)", LED lighting power supply circuit for digital display. The input and output capacitors are used in the company's laminated ceramic capacitor (MLCC), which can be built into a straight tube type LED lighting device inside the tube. Compared with the use of aluminum electrolytic capacitors, in addition to reducing the size of the product, but also to extend the life of the product. Input voltage support AC100V and 200V two.

The show is Murata Clear power module for Sodick development of LED lighting manufacturers. There is only for the Clear Sodick supply, but also consider other company sales oriented. Clear Sodick in straight type LED lighting business is equivalent to 20W, 40W and 100W fluorescent lamp, power supply module of all types of products can be used.

In order to obtain constant current of LED lighting, the DSP microcontroller is adopted. Switching frequency is about 200kHz. The output capacitor uses two MLCC of about 5 F. "In general, the capacity of the MLCC can not fully absorb the ripple current, but by improving the control side of the DSP, will not feel the flicker of the lighting device" (Murata manufacturing). The main circuit uses the non insulation lifting pressure type, does not have the PFC (power factor improvement) circuit. A size of 180mm * 19.4mm * 6.5mm

Reference display Clear Sodick production of straight tube LED lighting products. Built in power supply circuit. Equivalent to 40W fluorescent lamp power consumption is 19W, LED component number of 204.

Internal composition

There are two types of control based on the DSP microcontroller. The upper part is equipped with a microchip technology production of DSP products, the lower part is equipped with new Japan Radio Production DSP products.

It also puts forward the scheme of combination with human sensor

DSP microcontroller with microchip technology (Microchip Technology) "dsPIC33F GS series" and "Nippon wireless NJU20010 (Alligator) series two. The latter is just released July 2010 Nippon wireless products. The main circuit of the power supply module all almost all general, but by Nippon wireless power module DSP microcontroller to have higher output power, an increase of two inductance. Clear Sodick scheduled power module of the two types of classification using.