TDK Releases 1000V Capacitors for Automotive Wireless Power Supplies

On March 15, 2016, TDK released two multi-layer ceramic capacitor (MLCC) "CGA6" and "CGA9" voltages up to 1000V. The large electrostatic capacity and the small change in capacitance with temperature are two major characteristics of this product. Imagine an on-board circuit for a EV wireless power supply system or replace a film capacitor. From March 2016, production began at the TDK Akita Plant and sample shipments began. The initial production capacity is a maximum of 100,000/month.

Product dimensions and temperature characteristics, CGA6 size 3.2mm × 2.5mm (3225), support C0G; CGA9 size is 5.7mm × 5.0mm (5750), supports NP0. Supporting C0G means that the temperature coefficient is controlled within 0±30ppm/degree within the temperature range of -55 to 125°C. For example, even if the temperature rises from 25°C to 125°C, the change in capacitance can be controlled below 0.3%.

Supporting NP0 means that the temperature coefficient is controlled within 0±30 ppm/degree within the temperature range of -55 to 150°C. Support for NP0 will also support C0G.

In terms of capacitance, CGA6 has a maximum of 22nF and CGA9 has a maximum of 33nF at a rated voltage of 1000V. This is about 3 to 8 times that of other competing companies' MLCC products.

According to TDK, the capacitor used in current wireless power supply systems is a film capacitor. The size of the new MLCC product is only about one-tenth that of the MLCC. It is very large in the field of on-vehicle circuits for electric vehicle (EV) wireless power systems that want to reduce the size. Advantage. In addition, in addition to excellent temperature characteristics, MLCC also has advantages in heat resistance, moisture resistance, DC bias, and ESR (Equivalent DC Resistance). Unlike film capacitors, MLCCs do not require a resin or the like when mounted on a base plate, and can be surface-mounted by reflow soldering. Therefore, vibration resistance is also a problem for on-vehicle components. (Reporter: Nozawa Tetsuo)