Murata and Shizuki Electric Co., Inc. have jointly developed the FH series of heat-resistant film capacitors which can be used in a high-temperature environment of 125 degrees C. These products are ideally suited for converters and motor drive inverters for environmentally friendly automobiles, or other applications requiring high-temperature performance.
The FH series is rated for 450V and offers capacitances of 10-, 15-, and 20-μF. Additional specifications include a high-temperature load rating at 125 degrees C of 450V for 2,000 hours; a HTRB rating of 85 degrees C, 85% humidity also at 450V for 1000 hours; and a heat-shock resistance of 1000 cycles between -40 and +125 degrees C. Samples are scheduled to be available in September, with mass production beginning in April.
There are increasing demands from Manufacturers of hybrid vehicles, electric vehicles and environmentally friendly automobiles are increasing demands for electronic components that are compact, lightweight, and also have high dielectric capacitance and high heat resistance.
Capacitors used in converter and motor drive inverters are required to have a greater guarantee of high-temperature performance, than ever before, and also capacitors used in power supply lines are required to have a self-healing function. Generally, conventional high-temperature film capacitors were guaranteed to withstand temperatures of up to 105 degrees C, and there were apprehensions to the effect that the self-healing function was not very reliable, resulting in the occurrence of short mode breakdowns.
Murata has recently developed new high-temperature film material, and together with Shizuki Electric developed the heat-resistance film capacitors for automotive applications, which can be used continuously in a high-temperature environment of 125 degrees C and also have a reliable self-healing function. As a result of this development, the new products can be used in a temperature zone where conventional film capacitors could not be previously used.